-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 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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