21=r/9

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Solution for 21=r/9 equation:



21=r/9
We move all terms to the left:
21-(r/9)=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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