8=21+r

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Solution for 8=21+r equation: 



8=21+r

We move all terms to the left:

8-(21+r)=0

We add all the numbers together, and all the variables

-(r+21)+8=0

We get rid of parentheses

-r-21+8=0

We add all the numbers together, and all the variables

-1r-13=0

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

-r=13

r=13/-1

r=-13

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