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13r-20=6r+36
We move all terms to the left:
13r-20-(6r+36)=0
We get rid of parentheses
13r-6r-36-20=0
We add all the numbers together, and all the variables
7r-56=0
We move all terms containing r to the left, all other terms to the right
7r=56
r=56/7
r=8
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