10=9+u

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Solution for 10=9+u equation: 



10=9+u

We move all terms to the left:

10-(9+u)=0

We add all the numbers together, and all the variables

-(u+9)+10=0

We get rid of parentheses

-u-9+10=0

We add all the numbers together, and all the variables

-1u+1=0

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

-u=-1

u=-1/-1

u=1

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