31=12r+7

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Solution for 31=12r+7 equation: 



31=12r+7

We move all terms to the left:

31-(12r+7)=0

We get rid of parentheses

-12r-7+31=0

We add all the numbers together, and all the variables

-12r+24=0

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

-12r=-24

r=-24/-12

r=+2

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