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X+2(2X+15)=90
We move all terms to the left:
X+2(2X+15)-(90)=0
We multiply parentheses
X+4X+30-90=0
We add all the numbers together, and all the variables
5X-60=0
We move all terms containing X to the left, all other terms to the right
5X=60
X=60/5
X=12
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