21=r-30

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Solution for 21=r-30 equation: 



21=r-30

We move all terms to the left:

21-(r-30)=0

We get rid of parentheses

-r+30+21=0

We add all the numbers together, and all the variables

-1r+51=0

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

-r=-51

r=-51/-1

r=+51

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