10/40-20/x

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Solution for 10/40-20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

10/40-(20/x) = 0

10/40-20*x^-1 = 0

-20*x^-1 = -1/4 // : -20

x^-1 = 1/80

-1 < 0

1/(x^1) = 1/80 // * x^1

1 = 1/80*x^1 // : 1/80

80 = x^1

x = 80

x = 80

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