3r-12=30

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Solution for 3r-12=30 equation: 



3r-12=30

We move all terms to the left:

3r-12-(30)=0

We add all the numbers together, and all the variables

3r-42=0

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

3r=42

r=42/3

r=14

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