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180=60+X+87+X+57
We move all terms to the left:
180-(60+X+87+X+57)=0
We add all the numbers together, and all the variables
-(2X+204)+180=0
We get rid of parentheses
-2X-204+180=0
We add all the numbers together, and all the variables
-2X-24=0
We move all terms containing X to the left, all other terms to the right
-2X=24
X=24/-2
X=-12
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