6=9+u

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Solution for 6=9+u equation: 



6=9+u

We move all terms to the left:

6-(9+u)=0

We add all the numbers together, and all the variables

-(u+9)+6=0

We get rid of parentheses

-u-9+6=0

We add all the numbers together, and all the variables

-1u-3=0

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

-u=3

u=3/-1

u=-3

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