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104=8r-8
We move all terms to the left:
104-(8r-8)=0
We get rid of parentheses
-8r+8+104=0
We add all the numbers together, and all the variables
-8r+112=0
We move all terms containing r to the left, all other terms to the right
-8r=-112
r=-112/-8
r=+14
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