4-7x=21x

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Solution for 4-7x=21x equation: 



4-7x=21x

We move all terms to the left:

4-7x-(21x)=0

We add all the numbers together, and all the variables

-28x+4=0

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

-28x=-4

x=-4/-28

x=1/7

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