4=9u-7u

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Solution for 4=9u-7u equation: 



4=9u-7u

We move all terms to the left:

4-(9u-7u)=0

We add all the numbers together, and all the variables

-(+2u)+4=0

We get rid of parentheses

-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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