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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = (z-x)/x // - (z-x)/x
Y-((z-x)/x) = 0
(-1*(z-x))/x+Y = 0
(-1*(z-x))/x+(Y*x)/x = 0
Y*x-1*(z-x) = 0
Y*x+x-z = 0
Y*x+x-z = 0
Y*x-z = 0 // + z
Y*x = z // : Y
x = z/Y
x-(Y^-1*z) = 0
(x-(Y^-1*z))/x = 0
(x-(Y^-1*z))/x = 0 // * x
x-(Y^-1*z) = 0
x-(Y^-1*z) = 0 // + Y^-1*z
x = Y^-1*z
x = Y^-1*z
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