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(5x+10)+(7x+17)=135
We move all terms to the left:
(5x+10)+(7x+17)-(135)=0
We get rid of parentheses
5x+7x+10+17-135=0
We add all the numbers together, and all the variables
12x-108=0
We move all terms containing x to the left, all other terms to the right
12x=108
x=108/12
x=9
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