21,000-0.4x=x

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Solution for 21,000-0.4x=x equation: 



21.000-0.4x=x

We move all terms to the left:

21.000-0.4x-(x)=0

We add all the numbers together, and all the variables

-1.4x+21=0

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

-1.4x=-21

x=-21/-1.4

x=+15

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