# Math Help - Equation with 2 sets of Brackets

1. ## Equation with 2 sets of Brackets

I can do these normally but this one has confused me.

$4(3x-7)-5(2x-4)$

$
12x-28-10x+20=3x
$

Then I get

$
2x-8=3x
$

so

$x = -8/5$

This is wrong, why?
x is supposed to = -8

2. I assume that the starting equation is actually $\displaystyle 4(3x-7) - 5(2x-4) = 3x$.

You are correct up to $\displaystyle 2x - 8 = 3x$

$\displaystyle 2x - 8 - 2x = 3x - 2x$

$\displaystyle -8 = x$.

3. That's right. but where's the extra 2x come from?

OOOMG I see, why do I make things SOOOOO much harder than they actually are??!! For some reason I was adding 2x to one side and subtracting it from the other.