-21=r-15

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Solution for -21=r-15 equation: 



-21=r-15

We move all terms to the left:

-21-(r-15)=0

We get rid of parentheses

-r+15-21=0

We add all the numbers together, and all the variables

-1r-6=0

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

-r=6

r=6/-1

r=-6

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