31=3u+11

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Solution for 31=3u+11 equation: 



31=3u+11

We move all terms to the left:

31-(3u+11)=0

We get rid of parentheses

-3u-11+31=0

We add all the numbers together, and all the variables

-3u+20=0

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

-3u=-20

u=-20/-3

u=6+2/3

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