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(x+15)+(2x+34)=13
We move all terms to the left:
(x+15)+(2x+34)-(13)=0
We get rid of parentheses
x+2x+15+34-13=0
We add all the numbers together, and all the variables
3x+36=0
We move all terms containing x to the left, all other terms to the right
3x=-36
x=-36/3
x=-12
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