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2(3r+2)=8
We move all terms to the left:
2(3r+2)-(8)=0
We multiply parentheses
6r+4-8=0
We add all the numbers together, and all the variables
6r-4=0
We move all terms containing r to the left, all other terms to the right
6r=4
r=4/6
r=2/3
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