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-85=4r-5
We move all terms to the left:
-85-(4r-5)=0
We get rid of parentheses
-4r+5-85=0
We add all the numbers together, and all the variables
-4r-80=0
We move all terms containing r to the left, all other terms to the right
-4r=80
r=80/-4
r=-20
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