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X+2X+(2X-15)=85
We move all terms to the left:
X+2X+(2X-15)-(85)=0
We add all the numbers together, and all the variables
3X+(2X-15)-85=0
We get rid of parentheses
3X+2X-15-85=0
We add all the numbers together, and all the variables
5X-100=0
We move all terms containing X to the left, all other terms to the right
5X=100
X=100/5
X=20
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