-4-u=u

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Solution for -4-u=u equation: 



-4-u=u

We move all terms to the left:

-4-u-(u)=0

We add all the numbers together, and all the variables

-2u-4=0

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

-2u=4

u=4/-2

u=-2

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