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X+(X-15)=35
We move all terms to the left:
X+(X-15)-(35)=0
We get rid of parentheses
X+X-15-35=0
We add all the numbers together, and all the variables
2X-50=0
We move all terms containing X to the left, all other terms to the right
2X=50
X=50/2
X=25
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