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(7x+13)-4x=34
We move all terms to the left:
(7x+13)-4x-(34)=0
We add all the numbers together, and all the variables
-4x+(7x+13)-34=0
We get rid of parentheses
-4x+7x+13-34=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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