-20=3+u

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Solution for -20=3+u equation: 



-20=3+u

We move all terms to the left:

-20-(3+u)=0

We add all the numbers together, and all the variables

-(u+3)-20=0

We get rid of parentheses

-u-3-20=0

We add all the numbers together, and all the variables

-1u-23=0

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

-u=23

u=23/-1

u=-23

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