20=u-

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Solution for 20=u- equation: 



20=u-

We move all terms to the left:

20-(u-)=0

We add all the numbers together, and all the variables

-(+u)+20=0

We get rid of parentheses

-u+20=0

We add all the numbers together, and all the variables

-1u+20=0

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

-u=-20

u=-20/-1

u=+20

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