-12=3r+-3

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Solution for -12=3r+-3 equation: 



-12=3r+-3

We move all terms to the left:

-12-(3r+-3)=0

We add all the numbers together, and all the variables

-(3r-3)-12=0

We get rid of parentheses

-3r+3-12=0

We add all the numbers together, and all the variables

-3r-9=0

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

-3r=9

r=9/-3

r=-3

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