21=5r-9

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Solution for 21=5r-9 equation: 



21=5r-9

We move all terms to the left:

21-(5r-9)=0

We get rid of parentheses

-5r+9+21=0

We add all the numbers together, and all the variables

-5r+30=0

We move all terms containing r to the left, all other terms to the right

-5r=-30

r=-30/-5

r=+6

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