21=8-r

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Solution for 21=8-r equation: 



21=8-r

We move all terms to the left:

21-(8-r)=0

We add all the numbers together, and all the variables

-(-1r+8)+21=0

We get rid of parentheses

1r-8+21=0

We add all the numbers together, and all the variables

r+13=0

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

r=-13

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