31=22+u

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Solution for 31=22+u equation: 



31=22+u

We move all terms to the left:

31-(22+u)=0

We add all the numbers together, and all the variables

-(u+22)+31=0

We get rid of parentheses

-u-22+31=0

We add all the numbers together, and all the variables

-1u+9=0

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

-u=-9

u=-9/-1

u=+9

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