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3(2r-7)=6
We move all terms to the left:
3(2r-7)-(6)=0
We multiply parentheses
6r-21-6=0
We add all the numbers together, and all the variables
6r-27=0
We move all terms containing r to the left, all other terms to the right
6r=27
r=27/6
r=4+1/2
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