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X=1.5X-90
We move all terms to the left:
X-(1.5X-90)=0
We get rid of parentheses
X-1.5X+90=0
We add all the numbers together, and all the variables
-0.5X+90=0
We move all terms containing X to the left, all other terms to the right
-0.5X=-90
X=-90/-0.5
X=+180
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