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88=3r+5r
We move all terms to the left:
88-(3r+5r)=0
We add all the numbers together, and all the variables
-(+8r)+88=0
We get rid of parentheses
-8r+88=0
We move all terms containing r to the left, all other terms to the right
-8r=-88
r=-88/-8
r=+11
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