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(X+15)+(3X+25)=180
We move all terms to the left:
(X+15)+(3X+25)-(180)=0
We get rid of parentheses
X+3X+15+25-180=0
We add all the numbers together, and all the variables
4X-140=0
We move all terms containing X to the left, all other terms to the right
4X=140
X=140/4
X=35
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