31=4r+11

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Solution for 31=4r+11 equation: 



31=4r+11

We move all terms to the left:

31-(4r+11)=0

We get rid of parentheses

-4r-11+31=0

We add all the numbers together, and all the variables

-4r+20=0

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

-4r=-20

r=-20/-4

r=+5

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