-7=4+u

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Solution for -7=4+u equation: 



-7=4+u

We move all terms to the left:

-7-(4+u)=0

We add all the numbers together, and all the variables

-(u+4)-7=0

We get rid of parentheses

-u-4-7=0

We add all the numbers together, and all the variables

-1u-11=0

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

-u=11

u=11/-1

u=-11

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