1/x-2/5=4/x

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Solution for 1/x-2/5=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

1/x-(2/5) = 4/x // - 4/x

1/x-(4/x)-(2/5) = 0

1/x-4*x^-1-2/5 = 0

-3*x^-1 = 2/5 // : -3

x^-1 = -2/15

-1 < 0

1/(x^1) = -2/15 // * x^1

1 = -2/15*x^1 // : -2/15

-15/2 = x^1

x = -15/2

x = -15/2

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