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3(5r+7)=21+3r
We move all terms to the left:
3(5r+7)-(21+3r)=0
We add all the numbers together, and all the variables
3(5r+7)-(3r+21)=0
We multiply parentheses
15r-(3r+21)+21=0
We get rid of parentheses
15r-3r-21+21=0
We add all the numbers together, and all the variables
12r=0
r=0/12
r=0
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