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x=1.5(90-x)
We move all terms to the left:
x-(1.5(90-x))=0
We add all the numbers together, and all the variables
x-(1.5(-1x+90))=0
We calculate terms in parentheses: -(1.5(-1x+90)), so:We get rid of parentheses
1.5(-1x+90)
We multiply parentheses
-1.5x+135
Back to the equation:
-(-1.5x+135)
x+1.5x-135=0
We add all the numbers together, and all the variables
2.5x-135=0
We move all terms containing x to the left, all other terms to the right
2.5x=135
x=135/2.5
x=54
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