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3(r-6)=8
We move all terms to the left:
3(r-6)-(8)=0
We multiply parentheses
3r-18-8=0
We add all the numbers together, and all the variables
3r-26=0
We move all terms containing r to the left, all other terms to the right
3r=26
r=26/3
r=8+2/3
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