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27x-45=9(2x+7)
We move all terms to the left:
27x-45-(9(2x+7))=0
We calculate terms in parentheses: -(9(2x+7)), so:We get rid of parentheses
9(2x+7)
We multiply parentheses
18x+63
Back to the equation:
-(18x+63)
27x-18x-63-45=0
We add all the numbers together, and all the variables
9x-108=0
We move all terms containing x to the left, all other terms to the right
9x=108
x=108/9
x=12
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