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90=9(q+3)
We move all terms to the left:
90-(9(q+3))=0
We calculate terms in parentheses: -(9(q+3)), so:We get rid of parentheses
9(q+3)
We multiply parentheses
9q+27
Back to the equation:
-(9q+27)
-9q-27+90=0
We add all the numbers together, and all the variables
-9q+63=0
We move all terms containing q to the left, all other terms to the right
-9q=-63
q=-63/-9
q=+7
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