54=7u-u

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Solution for 54=7u-u equation: 



54=7u-u

We move all terms to the left:

54-(7u-u)=0

We add all the numbers together, and all the variables

-(+6u)+54=0

We get rid of parentheses

-6u+54=0

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

-6u=-54

u=-54/-6

u=+9

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