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(X+63)+(X+123)=180
We move all terms to the left:
(X+63)+(X+123)-(180)=0
We get rid of parentheses
X+X+63+123-180=0
We add all the numbers together, and all the variables
2X+6=0
We move all terms containing X to the left, all other terms to the right
2X=-6
X=-6/2
X=-3
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