Question

okay here is anohter -
3(a+7)/2 = 21

Yes I'm stuck. Tried this one the way you showed above - which made total sense, but can't figure this one out.

Answer 1

\[21*2/3-7=a\]

Answer 2

?

Answer 3

what that person means is that you need to multiply the 2 on both sides to get rid of the fraction

Answer 4

I see that can you show it

Answer 5

3(a+7)/2*2=21*2
3(a+7)/3=21*2/3
a+7-7=21*2/3-7
a=21*2/3-7

Answer 6

Yes, I'm a mom trying to help my daughter with this. It's been years since I've done algebra. Sorry

Answer 7

its okay :)

Answer 8

Sorry still not following - you are throwing me off on the 3.

Answer 9

okay well i did it differently

Answer 10

21*2=3(a-7)
42=3(a-7)
42=3a-21
63=3a
a=21

Answer 11

But it's 3(a+7) not minus how did this change from a plus to a minus?

Answer 12

oh shoot sorry!
42=3(a+7)
42=3a+21
21=3a
a=7

Answer 13

sorry it was my mistake i read it wrong sorry!!! :)

Answer 14

Sorry one more time, how did you get the 21 on the other side if I'm multiplying both sides by 2?

Answer 15

well i subtracted the 21 onto the other side
would you like to see a more detailed version?

Answer 16

yes please

Answer 17

I'm just lost - tried your theory on a differen tproblem - 2m-5/6=4 It didn' check

Answer 18

21*2=3(a-+7)?/2*2 to get rid of the fraction
42=3(a+7)
42=3*a +3*7 distributing
42=3a+21
42-21=3a+21-21 to move the 21 onto the other side
21=3a
then divide for a=7!

Answer 19

dont mind the question mark on the top one it was a typo

Answer 20

on your other equation the m doesnt always make a whole number

Answer 21

Staciwanichek... I suggest you google PEDMAS or BEDMAS.

Answer 22

thanks -