31=3r-11

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Solution for 31=3r-11 equation: 



31=3r-11

We move all terms to the left:

31-(3r-11)=0

We get rid of parentheses

-3r+11+31=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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