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X+(X+100)+2(X+100)=580
We move all terms to the left:
X+(X+100)+2(X+100)-(580)=0
We multiply parentheses
X+(X+100)+2X+200-580=0
We get rid of parentheses
X+X+2X+100+200-580=0
We add all the numbers together, and all the variables
4X-280=0
We move all terms containing X to the left, all other terms to the right
4X=280
X=280/4
X=70
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