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(X+105)+(3X+55)=180
We move all terms to the left:
(X+105)+(3X+55)-(180)=0
We get rid of parentheses
X+3X+105+55-180=0
We add all the numbers together, and all the variables
4X-20=0
We move all terms containing X to the left, all other terms to the right
4X=20
X=20/4
X=5
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