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X=90-1.5X
We move all terms to the left:
X-(90-1.5X)=0
We add all the numbers together, and all the variables
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
2.5X-90=0
We move all terms containing X to the left, all other terms to the right
2.5X=90
X=90/2.5
X=36
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