4/10=8/x

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Solution for 4/10=8/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/10 = 8/x // - 8/x

4/10-(8/x) = 0

4/10-8*x^-1 = 0

-8*x^-1 = -2/5 // : -8

x^-1 = 1/20

-1 < 0

1/(x^1) = 1/20 // * x^1

1 = 1/20*x^1 // : 1/20

20 = x^1

x = 20

x = 20

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