21=r+11

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Solution for 21=r+11 equation: 



21=r+11

We move all terms to the left:

21-(r+11)=0

We get rid of parentheses

-r-11+21=0

We add all the numbers together, and all the variables

-1r+10=0

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

-r=-10

r=-10/-1

r=+10

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