2/5=4/x

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Solution for 2/5=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

2/5 = 4/x // - 4/x

2/5-(4/x) = 0

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

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

x^-1 = 1/10

-1 < 0

1/(x^1) = 1/10 // * x^1

1 = 1/10*x^1 // : 1/10

10 = x^1

x = 10

x = 10

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