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(3r-1)+r=71
We move all terms to the left:
(3r-1)+r-(71)=0
We add all the numbers together, and all the variables
r+(3r-1)-71=0
We get rid of parentheses
r+3r-1-71=0
We add all the numbers together, and all the variables
4r-72=0
We move all terms containing r to the left, all other terms to the right
4r=72
r=72/4
r=18
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