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8(r+10)+6=102
We move all terms to the left:
8(r+10)+6-(102)=0
We add all the numbers together, and all the variables
8(r+10)-96=0
We multiply parentheses
8r+80-96=0
We add all the numbers together, and all the variables
8r-16=0
We move all terms containing r to the left, all other terms to the right
8r=16
r=16/8
r=2
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