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(7x)-4=3+8x
We move all terms to the left:
(7x)-4-(3+8x)=0
We add all the numbers together, and all the variables
7x-(8x+3)-4=0
We get rid of parentheses
7x-8x-3-4=0
We add all the numbers together, and all the variables
-1x-7=0
We move all terms containing x to the left, all other terms to the right
-x=7
x=7/-1
x=-7
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