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(3r+2)=8
We move all terms to the left:
(3r+2)-(8)=0
We get rid of parentheses
3r+2-8=0
We add all the numbers together, and all the variables
3r-6=0
We move all terms containing r to the left, all other terms to the right
3r=6
r=6/3
r=2
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