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-20=-17+r
We move all terms to the left:
-20-(-17+r)=0
We add all the numbers together, and all the variables
-(r-17)-20=0
We get rid of parentheses
-r+17-20=0
We add all the numbers together, and all the variables
-1r-3=0
We move all terms containing r to the left, all other terms to the right
-r=3
r=3/-1
r=-3
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