-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-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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