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6(3r-3)=108
We move all terms to the left:
6(3r-3)-(108)=0
We multiply parentheses
18r-18-108=0
We add all the numbers together, and all the variables
18r-126=0
We move all terms containing r to the left, all other terms to the right
18r=126
r=126/18
r=7
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