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93=8+5r
We move all terms to the left:
93-(8+5r)=0
We add all the numbers together, and all the variables
-(5r+8)+93=0
We get rid of parentheses
-5r-8+93=0
We add all the numbers together, and all the variables
-5r+85=0
We move all terms containing r to the left, all other terms to the right
-5r=-85
r=-85/-5
r=+17
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