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-5(5-3r)=-85
We move all terms to the left:
-5(5-3r)-(-85)=0
We add all the numbers together, and all the variables
-5(-3r+5)-(-85)=0
We add all the numbers together, and all the variables
-5(-3r+5)+85=0
We multiply parentheses
15r-25+85=0
We add all the numbers together, and all the variables
15r+60=0
We move all terms containing r to the left, all other terms to the right
15r=-60
r=-60/15
r=-4
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