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90=6(r+5)
We move all terms to the left:
90-(6(r+5))=0
We calculate terms in parentheses: -(6(r+5)), so:We get rid of parentheses
6(r+5)
We multiply parentheses
6r+30
Back to the equation:
-(6r+30)
-6r-30+90=0
We add all the numbers together, and all the variables
-6r+60=0
We move all terms containing r to the left, all other terms to the right
-6r=-60
r=-60/-6
r=+10
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