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-(r/17)+21=31
We move all terms to the left:
-(r/17)+21-(31)=0
We add all the numbers together, and all the variables
-(+r/17)+21-31=0
We add all the numbers together, and all the variables
-(+r/17)-10=0
We get rid of parentheses
-r/17-10=0
We multiply all the terms by the denominator
-r-10*17=0
We add all the numbers together, and all the variables
-1r-170=0
We move all terms containing r to the left, all other terms to the right
-r=170
r=170/-1
r=-170
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