-4=-5+u

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Solution for -4=-5+u equation: 



-4=-5+u

We move all terms to the left:

-4-(-5+u)=0

We add all the numbers together, and all the variables

-(u-5)-4=0

We get rid of parentheses

-u+5-4=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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