20=20+9u

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Solution for 20=20+9u equation: 



20=20+9u

We move all terms to the left:

20-(20+9u)=0

We add all the numbers together, and all the variables

-(9u+20)+20=0

We get rid of parentheses

-9u-20+20=0

We add all the numbers together, and all the variables

-9u=0

u=0/-9

u=0

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