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13+5r=13+17r
We move all terms to the left:
13+5r-(13+17r)=0
We add all the numbers together, and all the variables
5r-(17r+13)+13=0
We get rid of parentheses
5r-17r-13+13=0
We add all the numbers together, and all the variables
-12r=0
r=0/-12
r=0
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