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(X+20)+(36)+(3X)=180
We move all terms to the left:
(X+20)+(36)+(3X)-(180)=0
We add all the numbers together, and all the variables
3X+(X+20)-144=0
We get rid of parentheses
3X+X+20-144=0
We add all the numbers together, and all the variables
4X-124=0
We move all terms containing X to the left, all other terms to the right
4X=124
X=124/4
X=31
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