-12=-4+u

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Solution for -12=-4+u equation: 



-12=-4+u

We move all terms to the left:

-12-(-4+u)=0

We add all the numbers together, and all the variables

-(u-4)-12=0

We get rid of parentheses

-u+4-12=0

We add all the numbers together, and all the variables

-1u-8=0

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

-u=8

u=8/-1

u=-8

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