31=3u+4

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Solution for 31=3u+4 equation: 



31=3u+4

We move all terms to the left:

31-(3u+4)=0

We get rid of parentheses

-3u-4+31=0

We add all the numbers together, and all the variables

-3u+27=0

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

-3u=-27

u=-27/-3

u=+9

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