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90=2(x/3-15)
We move all terms to the left:
90-(2(x/3-15))=0
We multiply all the terms by the denominator
-(2(x+90*3-15))=0
We calculate terms in parentheses: -(2(x+90*3-15)), so:We get rid of parentheses
2(x+90*3-15)
We add all the numbers together, and all the variables
2(x+255)
We multiply parentheses
2x+510
Back to the equation:
-(2x+510)
-2x-510=0
We move all terms containing x to the left, all other terms to the right
-2x=510
x=510/-2
x=-255
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