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85=-5+6r
We move all terms to the left:
85-(-5+6r)=0
We add all the numbers together, and all the variables
-(6r-5)+85=0
We get rid of parentheses
-6r+5+85=0
We add all the numbers together, and all the variables
-6r+90=0
We move all terms containing r to the left, all other terms to the right
-6r=-90
r=-90/-6
r=+15
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