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3r-3(6r-2)=126
We move all terms to the left:
3r-3(6r-2)-(126)=0
We multiply parentheses
3r-18r+6-126=0
We add all the numbers together, and all the variables
-15r-120=0
We move all terms containing r to the left, all other terms to the right
-15r=120
r=120/-15
r=-8
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