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-8(r-87)=-88
We move all terms to the left:
-8(r-87)-(-88)=0
We add all the numbers together, and all the variables
-8(r-87)+88=0
We multiply parentheses
-8r+696+88=0
We add all the numbers together, and all the variables
-8r+784=0
We move all terms containing r to the left, all other terms to the right
-8r=-784
r=-784/-8
r=+98
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