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100=2(x-9)
We move all terms to the left:
100-(2(x-9))=0
We calculate terms in parentheses: -(2(x-9)), so:We get rid of parentheses
2(x-9)
We multiply parentheses
2x-18
Back to the equation:
-(2x-18)
-2x+18+100=0
We add all the numbers together, and all the variables
-2x+118=0
We move all terms containing x to the left, all other terms to the right
-2x=-118
x=-118/-2
x=+59
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