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5r-1=-2r+13
We move all terms to the left:
5r-1-(-2r+13)=0
We get rid of parentheses
5r+2r-13-1=0
We add all the numbers together, and all the variables
7r-14=0
We move all terms containing r to the left, all other terms to the right
7r=14
r=14/7
r=2
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