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(X+5)+(2X+7)=180
We move all terms to the left:
(X+5)+(2X+7)-(180)=0
We get rid of parentheses
X+2X+5+7-180=0
We add all the numbers together, and all the variables
3X-168=0
We move all terms containing X to the left, all other terms to the right
3X=168
X=168/3
X=56
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