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(X+3)+(2X-135)=180
We move all terms to the left:
(X+3)+(2X-135)-(180)=0
We get rid of parentheses
X+2X+3-135-180=0
We add all the numbers together, and all the variables
3X-312=0
We move all terms containing X to the left, all other terms to the right
3X=312
X=312/3
X=104
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