u+84=8u

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Solution for u+84=8u equation: 



u+84=8u

We move all terms to the left:

u+84-(8u)=0

We add all the numbers together, and all the variables

-7u+84=0

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

-7u=-84

u=-84/-7

u=+12

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