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7-(3r-1)+3r=137
We move all terms to the left:
7-(3r-1)+3r-(137)=0
We add all the numbers together, and all the variables
3r-(3r-1)-130=0
We get rid of parentheses
3r-3r+1-130=0
We add all the numbers together, and all the variables
-129!=0
There is no solution for this equation
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