y=20/x

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Solution for y=20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = 20/x // - 20/x

y-(20/x) = 0

y-20*x^-1 = 0

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

x^-1 = y/20

-1 < 0

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

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

20*y^-1 = x^1

x = 20*y^-1

x = 20*y^-1

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