-3=-u

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Solution for -3=-u equation: 



-3=-u

We move all terms to the left:

-3-(-u)=0

We add all the numbers together, and all the variables

-(-1u)-3=0

We get rid of parentheses

1u-3=0

We add all the numbers together, and all the variables

u-3=0

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

u=3

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