9x-4=21x

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Solution for 9x-4=21x equation: 



9x-4=21x

We move all terms to the left:

9x-4-(21x)=0

We add all the numbers together, and all the variables

-12x-4=0

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

-12x=4

x=4/-12

x=-1/3

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