9r+12=30

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Solution for 9r+12=30 equation: 



9r+12=30

We move all terms to the left:

9r+12-(30)=0

We add all the numbers together, and all the variables

9r-18=0

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

9r=18

r=18/9

r=2

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