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3r=131/2
We move all terms to the left:
3r-(131/2)=0
We add all the numbers together, and all the variables
3r-(+131/2)=0
We get rid of parentheses
3r-131/2=0
We multiply all the terms by the denominator
3r*2-131=0
Wy multiply elements
6r-131=0
We move all terms containing r to the left, all other terms to the right
6r=131
r=131/6
r=21+5/6
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