-3=3r+12

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Solution for -3=3r+12 equation: 



-3=3r+12

We move all terms to the left:

-3-(3r+12)=0

We get rid of parentheses

-3r-12-3=0

We add all the numbers together, and all the variables

-3r-15=0

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

-3r=15

r=15/-3

r=-5

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