-12=-r+3

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Solution for -12=-r+3 equation: 



-12=-r+3

We move all terms to the left:

-12-(-r+3)=0

We add all the numbers together, and all the variables

-(-1r+3)-12=0

We get rid of parentheses

1r-3-12=0

We add all the numbers together, and all the variables

r-15=0

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

r=15

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