12+3r=-57

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Solution for 12+3r=-57 equation: 



12+3r=-57

We move all terms to the left:

12+3r-(-57)=0

We add all the numbers together, and all the variables

3r+69=0

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

3r=-69

r=-69/3

r=-23

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