4/x=2/5

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Solution for 4/x=2/5 equation: 


D( x )

x = 0

x = 0

x = 0

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

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

4/x-(2/5) = 0

4/x-2/5 = 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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