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X+100+(X+12)=180
We move all terms to the left:
X+100+(X+12)-(180)=0
We add all the numbers together, and all the variables
X+(X+12)-80=0
We get rid of parentheses
X+X+12-80=0
We add all the numbers together, and all the variables
2X-68=0
We move all terms containing X to the left, all other terms to the right
2X=68
X=68/2
X=34
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