21=r-12=

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Solution for 21=r-12= equation: 



21=r-12=

We move all terms to the left:

21-(r-12)=0

We get rid of parentheses

-r+12+21=0

We add all the numbers together, and all the variables

-1r+33=0

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

-r=-33

r=-33/-1

r=+33

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