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-13-8=r/9
We move all terms to the left:
-13-8-(r/9)=0
We add all the numbers together, and all the variables
-(+r/9)-13-8=0
We add all the numbers together, and all the variables
-(+r/9)-21=0
We get rid of parentheses
-r/9-21=0
We multiply all the terms by the denominator
-r-21*9=0
We add all the numbers together, and all the variables
-1r-189=0
We move all terms containing r to the left, all other terms to the right
-r=189
r=189/-1
r=-189
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