31=3u-20

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Solution for 31=3u-20 equation: 



31=3u-20

We move all terms to the left:

31-(3u-20)=0

We get rid of parentheses

-3u+20+31=0

We add all the numbers together, and all the variables

-3u+51=0

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

-3u=-51

u=-51/-3

u=+17

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