20=u+1

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Solution for 20=u+1 equation: 



20=u+1

We move all terms to the left:

20-(u+1)=0

We get rid of parentheses

-u-1+20=0

We add all the numbers together, and all the variables

-1u+19=0

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

-u=-19

u=-19/-1

u=+19

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