85/x=20

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Solution for 85/x=20 equation: 


D( x )

x = 0

x = 0

x = 0

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

85/x = 20 // - 20

85/x-20 = 0

85*x^-1 = 20 // : 85

x^-1 = 4/17

-1 < 0

1/(x^1) = 4/17 // * x^1

1 = 4/17*x^1 // : 4/17

17/4 = x^1

x = 17/4

x = 17/4

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