# 7x=3x-80

how do u do it and check it?

 Curlyben Posts: 18,167, Reputation: 8753 Admin & Wine Expert #2 Jun 13, 2012, 01:26 PM
What are you trying to do ?
 qwertyuioop Posts: 87, Reputation: 1 Junior Member #3 Jun 13, 2012, 01:28 PM
Quote:
 Originally Posted by qwertyuioop how do u do it and check it?
i have 2 solve the equation and check my answer.
And find what x is! ?
 Curlyben Posts: 18,167, Reputation: 8753 Admin & Wine Expert #4 Jun 13, 2012, 01:29 PM
What have you done so far.
Remember you do the same action on BOTH sides..
 qwertyuioop Posts: 87, Reputation: 1 Junior Member #5 Jun 13, 2012, 01:33 PM
7x=3x-80
7((times) how do u write times besides x)-3x+80=0
(7-3)x+80=0
4x+80=0
now the q is hoe do i continue it?
 Curlyben Posts: 18,167, Reputation: 8753 Admin & Wine Expert #6 Jun 13, 2012, 01:40 PM
So you are here

$4x+80=0$
Just take 80 from both sides and then you'll see what to do next..
 qwertyuioop Posts: 87, Reputation: 1 Junior Member #7 Jun 13, 2012, 01:42 PM
hu i dont get that so u add 4x+80???
 Curlyben Posts: 18,167, Reputation: 8753 Admin & Wine Expert #8 Jun 13, 2012, 01:44 PM
You want to move the 80 to the left in the form
so you get

$4x+80-80 = -80$

Whats next ?
 qwertyuioop Posts: 87, Reputation: 1 Junior Member #9 Jun 13, 2012, 01:49 PM
so then u divide 80 divided by 4 and u get -20???
if it correct thnx sooooo much
 Curlyben Posts: 18,167, Reputation: 8753 Admin & Wine Expert #10 Jun 13, 2012, 01:50 PM
Do you see how that worked ?
Same action on both sides..