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X+2(2X-20)=180
We move all terms to the left:
X+2(2X-20)-(180)=0
We multiply parentheses
X+4X-40-180=0
We add all the numbers together, and all the variables
5X-220=0
We move all terms containing X to the left, all other terms to the right
5X=220
X=220/5
X=44
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