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13r-4=8r+11
We move all terms to the left:
13r-4-(8r+11)=0
We get rid of parentheses
13r-8r-11-4=0
We add all the numbers together, and all the variables
5r-15=0
We move all terms containing r to the left, all other terms to the right
5r=15
r=15/5
r=3
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