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90=5(q+10)
We move all terms to the left:
90-(5(q+10))=0
We calculate terms in parentheses: -(5(q+10)), so:We get rid of parentheses
5(q+10)
We multiply parentheses
5q+50
Back to the equation:
-(5q+50)
-5q-50+90=0
We add all the numbers together, and all the variables
-5q+40=0
We move all terms containing q to the left, all other terms to the right
-5q=-40
q=-40/-5
q=+8
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