-6=3+u

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Solution for -6=3+u equation: 



-6=3+u

We move all terms to the left:

-6-(3+u)=0

We add all the numbers together, and all the variables

-(u+3)-6=0

We get rid of parentheses

-u-3-6=0

We add all the numbers together, and all the variables

-1u-9=0

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

-u=9

u=9/-1

u=-9

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