12=-3r+54

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Solution for 12=-3r+54 equation: 



12=-3r+54

We move all terms to the left:

12-(-3r+54)=0

We get rid of parentheses

3r-54+12=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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