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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 24/x // - 24/x
y-(24/x) = 0
y-24*x^-1 = 0
-24*x^-1 = -y // : -24
x^-1 = y/24
-1 < 0
1/(x^1) = y/24 // * x^1
1 = x^1*(y/24) // : y/24
24*y^-1 = x^1
x = 24*y^-1
x = 24*y^-1
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