x+42=4x

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Solution for x+42=4x equation: 



x+42=4x

We move all terms to the left:

x+42-(4x)=0

We add all the numbers together, and all the variables

-3x+42=0

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

-3x=-42

x=-42/-3

x=+14

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