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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
1/(x+4)+1/z = 0
(1*z)/(z*(x+4))+(1*(x+4))/(z*(x+4)) = 0
1*(x+4)+1*z = 0
x+z+4 = 0
(x+z+4)/(z*(x+4)) = 0
(x+z+4)/(z*(x+4)) = 0 // * z*(x+4)
x+z+4 = 0
x+z+4 = 0 // - z+4
x = -(z+4)
x = -(z+4)
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