3u-84=u

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Solution for 3u-84=u equation: 



3u-84=u

We move all terms to the left:

3u-84-(u)=0

We add all the numbers together, and all the variables

2u-84=0

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

2u=84

u=84/2

u=42

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