u+84=7u

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Solution for u+84=7u equation: 



u+84=7u

We move all terms to the left:

u+84-(7u)=0

We add all the numbers together, and all the variables

-6u+84=0

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

-6u=-84

u=-84/-6

u=+14

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