31=4-3u

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Solution for 31=4-3u equation: 



31=4-3u

We move all terms to the left:

31-(4-3u)=0

We add all the numbers together, and all the variables

-(-3u+4)+31=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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