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13r-2=8r+8
We move all terms to the left:
13r-2-(8r+8)=0
We get rid of parentheses
13r-8r-8-2=0
We add all the numbers together, and all the variables
5r-10=0
We move all terms containing r to the left, all other terms to the right
5r=10
r=10/5
r=2
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