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-17=r/30
We move all terms to the left:
-17-(r/30)=0
We add all the numbers together, and all the variables
-(+r/30)-17=0
We get rid of parentheses
-r/30-17=0
We multiply all the terms by the denominator
-r-17*30=0
We add all the numbers together, and all the variables
-1r-510=0
We move all terms containing r to the left, all other terms to the right
-r=510
r=510/-1
r=-510
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