Question

-12x=72

Answer 1

Divide both sides by -12.

Answer 2

-12x=72/-12

Answer 3

You have to do the same operation to both sides.
Since to get rid of the -12 on the left side, you must divide by -12, you also divide the right side by -12.
(-12x)/(-12) = 72/(-12)

Answer 4

(-12x)/(-12) = x and 72/(-12) = -6, so the equation becomes
x = -6

Answer 5

So whatever you do on one side you have to do it to the other

Answer 6

so if 10x+3=15 would be 10x/10 + 3= 15/10 +3

Answer 7

Not quite it would be x+3=15/10
Then you would do x=(15/10)-3

Answer 8

ok so I would divide 15 and 10 then subtract 3

Answer 9

Yes

Answer 10

So what you do when you have a simple equation like that is to try and get x by itself.
You do this by doing the same to both sides whether that means subtracting, adding, multiplying or dividing.

Answer 11

15/10-3=1.5 so x equals 1.5

Answer 12

-1.5

Answer 13

Yep

Answer 14

Sweet

Answer 15

3(5-y)=3(y+4) would be 15-3y=3y+7

Answer 16

It would be 15-3y=3y+12

Answer 17

@YesMe
Yes, whatever operation you do to one side, you need to do to the other side.
To solve the example you gave above,
10x+3=15
First, you must subtract 3 from both sides:
10x + 3 - 3 = 15 - 3
10x = 12
Then you divide both sides by 10:
10x/10 = 12/10
x = 6/5 = 1.2