31=1-3u

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Solution for 31=1-3u equation: 



31=1-3u

We move all terms to the left:

31-(1-3u)=0

We add all the numbers together, and all the variables

-(-3u+1)+31=0

We get rid of parentheses

3u-1+31=0

We add all the numbers together, and all the variables

3u+30=0

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

3u=-30

u=-30/3

u=-10

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