9=4+u

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Solution for 9=4+u equation: 



9=4+u

We move all terms to the left:

9-(4+u)=0

We add all the numbers together, and all the variables

-(u+4)+9=0

We get rid of parentheses

-u-4+9=0

We add all the numbers together, and all the variables

-1u+5=0

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

-u=-5

u=-5/-1

u=+5

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