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5r-7=-13+2r
We move all terms to the left:
5r-7-(-13+2r)=0
We add all the numbers together, and all the variables
5r-(2r-13)-7=0
We get rid of parentheses
5r-2r+13-7=0
We add all the numbers together, and all the variables
3r+6=0
We move all terms containing r to the left, all other terms to the right
3r=-6
r=-6/3
r=-2
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