21=8r-11

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Solution for 21=8r-11 equation: 



21=8r-11

We move all terms to the left:

21-(8r-11)=0

We get rid of parentheses

-8r+11+21=0

We add all the numbers together, and all the variables

-8r+32=0

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

-8r=-32

r=-32/-8

r=+4

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