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90=2(x-12)
We move all terms to the left:
90-(2(x-12))=0
We calculate terms in parentheses: -(2(x-12)), so:We get rid of parentheses
2(x-12)
We multiply parentheses
2x-24
Back to the equation:
-(2x-24)
-2x+24+90=0
We add all the numbers together, and all the variables
-2x+114=0
We move all terms containing x to the left, all other terms to the right
-2x=-114
x=-114/-2
x=+57
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