-3=-7+u

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Solution for -3=-7+u equation: 



-3=-7+u

We move all terms to the left:

-3-(-7+u)=0

We add all the numbers together, and all the variables

-(u-7)-3=0

We get rid of parentheses

-u+7-3=0

We add all the numbers together, and all the variables

-1u+4=0

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

-u=-4

u=-4/-1

u=+4

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