x-42=3x

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Solution for x-42=3x equation: 



x-42=3x

We move all terms to the left:

x-42-(3x)=0

We add all the numbers together, and all the variables

-2x-42=0

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

-2x=42

x=42/-2

x=-21

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