4=4+2u-u

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Solution for 4=4+2u-u equation: 



4=4+2u-u

We move all terms to the left:

4-(4+2u-u)=0

We add all the numbers together, and all the variables

-(u+4)+4=0

We get rid of parentheses

-u-4+4=0

We add all the numbers together, and all the variables

-u=0

u=0/-1

u=0

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