-12=2r+2r

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Solution for -12=2r+2r equation: 



-12=2r+2r

We move all terms to the left:

-12-(2r+2r)=0

We add all the numbers together, and all the variables

-(+4r)-12=0

We get rid of parentheses

-4r-12=0

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

-4r=12

r=12/-4

r=-3

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