3(7r+1)=171

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Solution for 3(7r+1)=171 equation: 



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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