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8r=3+5r
We move all terms to the left:
8r-(3+5r)=0
We add all the numbers together, and all the variables
8r-(5r+3)=0
We get rid of parentheses
8r-5r-3=0
We add all the numbers together, and all the variables
3r-3=0
We move all terms containing r to the left, all other terms to the right
3r=3
r=3/3
r=1
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