13=r+21

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Solution for 13=r+21 equation: 



13=r+21

We move all terms to the left:

13-(r+21)=0

We get rid of parentheses

-r-21+13=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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