y=-18/x

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Solution for y=-18/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = -18/x // + -18/x

y-(-18/x) = 0

18*x^-1+y = 0

18*x^-1 = -y // : 18

x^-1 = -y/18

-1 < 0

1/(x^1) = -y/18 // * x^1

1 = x^1*(-y/18) // : -y/18

-18*y^-1 = x^1

x = -18*y^-1

x = -18*y^-1

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