12r+12=3r+84

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Solution for 12r+12=3r+84 equation: 



12r+12=3r+84

We move all terms to the left:

12r+12-(3r+84)=0

We get rid of parentheses

12r-3r-84+12=0

We add all the numbers together, and all the variables

9r-72=0

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

9r=72

r=72/9

r=8

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