4=u-3u

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Solution for 4=u-3u equation: 



4=u-3u

We move all terms to the left:

4-(u-3u)=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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