-4=-3+u

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Solution for -4=-3+u equation: 



-4=-3+u

We move all terms to the left:

-4-(-3+u)=0

We add all the numbers together, and all the variables

-(u-3)-4=0

We get rid of parentheses

-u+3-4=0

We add all the numbers together, and all the variables

-1u-1=0

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

-u=1

u=1/-1

u=-1

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