8/5=4/x

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Solution for 8/5=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

8/5 = 4/x // - 4/x

8/5-(4/x) = 0

8/5-4*x^-1 = 0

-4*x^-1 = -8/5 // : -4

x^-1 = 2/5

-1 < 0

1/(x^1) = 2/5 // * x^1

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

5/2 = x^1

x = 5/2

x = 5/2

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