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17=2r-5r-13
We move all terms to the left:
17-(2r-5r-13)=0
We add all the numbers together, and all the variables
-(-3r-13)+17=0
We get rid of parentheses
3r+13+17=0
We add all the numbers together, and all the variables
3r+30=0
We move all terms containing r to the left, all other terms to the right
3r=-30
r=-30/3
r=-10
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