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X+(X-40)=180
We move all terms to the left:
X+(X-40)-(180)=0
We get rid of parentheses
X+X-40-180=0
We add all the numbers together, and all the variables
2X-220=0
We move all terms containing X to the left, all other terms to the right
2X=220
X=220/2
X=110
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