0.8=0.4/x

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Solution for 0.8=0.4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

0.8 = 0.4/x // - 0.4/x

0.8-(0.4/x) = 0

0.8-0.4*x^-1 = 0

-0.4*x^-1 = -0.8 // : -0.4

x^-1 = 2

-1 < 0

1/(x^1) = 2 // * x^1

1 = 2*x^1 // : 2

1/2 = x^1

x = 1/2

x = 1/2

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