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-88=-77+17r
We move all terms to the left:
-88-(-77+17r)=0
We add all the numbers together, and all the variables
-(17r-77)-88=0
We get rid of parentheses
-17r+77-88=0
We add all the numbers together, and all the variables
-17r-11=0
We move all terms containing r to the left, all other terms to the right
-17r=11
r=11/-17
r=-11/17
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