54=12x-3x

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Solution for 54=12x-3x equation: 



54=12x-3x

We move all terms to the left:

54-(12x-3x)=0

We add all the numbers together, and all the variables

-(+9x)+54=0

We get rid of parentheses

-9x+54=0

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

-9x=-54

x=-54/-9

x=+6

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