21x-42=399

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Solution for 21x-42=399 equation: 



21x-42=399

We move all terms to the left:

21x-42-(399)=0

We add all the numbers together, and all the variables

21x-441=0

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

21x=441

x=441/21

x=21

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