12r+9=(-7)

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Solution for 12r+9=(-7) equation: 



12r+9=(-7)

We move all terms to the left:

12r+9-((-7))=0

We add all the numbers together, and all the variables

12r+16=0

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

12r=-16

r=-16/12

r=-1+1/3

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