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8r-2=13+3r
We move all terms to the left:
8r-2-(13+3r)=0
We add all the numbers together, and all the variables
8r-(3r+13)-2=0
We get rid of parentheses
8r-3r-13-2=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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