-15=z/-x

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Solution for -15=z/-x equation: 


D( x )

-x = 0

-x = 0

x = 0

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

-15 = z/(-x) // - z/(-x)

-(z/(-x))-15 = 0

x^-1*z-15 = 0

x^-1*z = 15 // : z

x^-1 = 15/z

-1 < 0

1/(x^1) = 15/z // * x^1

1 = x^1*(15/z) // : 15/z

1/(15/z) = x^1

x = 1/(15/z)

x = 1/(15/z)

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