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6(6r+3)=234
We move all terms to the left:
6(6r+3)-(234)=0
We multiply parentheses
36r+18-234=0
We add all the numbers together, and all the variables
36r-216=0
We move all terms containing r to the left, all other terms to the right
36r=216
r=216/36
r=6
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