Question

In order to solve the equation -3x - 6 = 5, the first step is to:

add 6 to both sides

divide by 5 on both sides

subtract 6 from both sides

multiply by 5 on both sides

Answer 1

what do you think?

Answer 2

I add 6 to both sides.

Answer 3

yup

Answer 4

-2x - 15 = 6x + 9

3

-3

-1

6

Answer 5

what do you think?

Answer 6

Idkk im confused.

Answer 7

so what is your first step?

Answer 8

i think you add 15 to both sides but idk.

Answer 9

that works

Answer 10

go ahead, and what do you get?

Answer 11

do you add it to 15 and 6?

Answer 12

? I don't understand that comment

Answer 13

Like what are you adding 15 to?

Answer 14

the 15 and 6 right?

Answer 15

both sides, you don't add it to anything in particu;lar, just tack it on the end

Answer 16

ie 4v+7=12
4v-7+7=12-7

Answer 17

woah where did that come from lol
so far i think i have it but ill show you
-2x-30=21x+9
-32x=21x+9
-32=30x?

Answer 18

Idkim so confused.

Answer 19

not quite

Answer 20

ofcourse not lol.

Answer 21

-2x - 15 = 6x + 9 so add 15 is good, but you do it like this
\[-2x - 15 = 6x + 9\]\[-2x-15+15=6x+9+15\]

Answer 22

now simplify

Answer 23

so the first half is -2?

Answer 24

no, you can't just drop the variable,

Answer 25

make sure you keep it

Answer 26

omgg that is dumb. So -2x=30x? is that wrong. or what im about to give up

Answer 27

you have the left, now lets work on the right. so we need to simplify(aka combine like terms) 6x+9+15

Answer 28

so let me make it a little more obvious:
\[6x+(9+15)\]

Answer 29

^I can do that because addition is associative ^

Answer 30

so then itll be 6x+24?

Answer 31

yep, so now you have \[-2x=6x+24\]

Answer 32

yea

Answer 33

what do you think you do now?

Answer 34

subtract -2?

Answer 35

no, remember we are getting all of the like terms together, so how could you get the 6x to the left side?

Answer 36

umm, maybe adding the like terms?

Answer 37

or subtracting

Answer 38

well, if I added 6x to both sides, what would I get? how about if I subtract?

Answer 39

-2x+6x=4
-2x-6x=-8

Answer 40

oh wait haha read that wrong. i think.

Answer 41

what happened to the 24 on the right?

Answer 42

-2x+24 = 22
=2x-24=-26

Answer 43

right?

Answer 44

no

Answer 45

stahp

Answer 46

ok, you have the left correct two steps back, but you changed the right. Don't it should be 24

Answer 47

would x = 18?

Answer 48

and you cannot add something with an x in it and something without an x

Answer 49

no

Answer 50

go back to here

Answer 51

-2x+6x=4
-2x-6x=-8

Answer 52

omgggg i hate math.

Answer 53

now, change the right to 24

Answer 54

you just have not learned the rules yet

Answer 55

what do you mean change it to 24?

Answer 56

https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions/cc-7th-2-step-equations/v/equations-2 You might want to watch these

Answer 57

I mean this:
-2x+6x=12x+24
-2x-6x=24

Answer 58

now, which is simpler?

Answer 59

so now wouldnt you subtract the -2x-6x

Answer 60

but you retain the x when you do

Answer 61

yes so it would be 4x=24?

Answer 62

no, what is (-2-6)x=24

Answer 63

simplify the parentheses

Answer 64

-8

Answer 65

so then we get -8x=24

Answer 66

now what.

Answer 67

divide each side by -8?

Answer 68

yup

Answer 69

x=-3?

Answer 70

yup

Answer 71

omggg

Answer 72

please do yourself a favor... Khanacademy.org go there

Answer 73

medal please?