31=7-3u

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Solution for 31=7-3u equation: 



31=7-3u

We move all terms to the left:

31-(7-3u)=0

We add all the numbers together, and all the variables

-(-3u+7)+31=0

We get rid of parentheses

3u-7+31=0

We add all the numbers together, and all the variables

3u+24=0

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

3u=-24

u=-24/3

u=-8

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