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3(7r+1)=171
We move all terms to the left:
3(7r+1)-(171)=0
We multiply parentheses
21r+3-171=0
We add all the numbers together, and all the variables
21r-168=0
We move all terms containing r to the left, all other terms to the right
21r=168
r=168/21
r=8
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