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-20-17r=-16r
We move all terms to the left:
-20-17r-(-16r)=0
We get rid of parentheses
-17r+16r-20=0
We add all the numbers together, and all the variables
-1r-20=0
We move all terms containing r to the left, all other terms to the right
-r=20
r=20/-1
r=-20
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