0.8=4000/x

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Solution for 0.8=4000/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

0.8 = 4000/x // - 4000/x

0.8-(4000/x) = 0

0.8-4000*x^-1 = 0

-4000*x^-1 = -0.8 // : -4000

x^-1 = 0.0002

-1 < 0

1/(x^1) = 0.0002 // * x^1

1 = 0.0002*x^1 // : 0.0002

5000 = x^1

x = 5000

x = 5000

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