-12=r+20

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Solution for -12=r+20 equation: 



-12=r+20

We move all terms to the left:

-12-(r+20)=0

We get rid of parentheses

-r-20-12=0

We add all the numbers together, and all the variables

-1r-32=0

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

-r=32

r=32/-1

r=-32

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