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79=8r-25
We move all terms to the left:
79-(8r-25)=0
We get rid of parentheses
-8r+25+79=0
We add all the numbers together, and all the variables
-8r+104=0
We move all terms containing r to the left, all other terms to the right
-8r=-104
r=-104/-8
r=+13
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