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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 30/x // - 30/x
y-(30/x) = 0
y-30*x^-1 = 0
-30*x^-1 = -y // : -30
x^-1 = y/30
-1 < 0
1/(x^1) = y/30 // * x^1
1 = x^1*(y/30) // : y/30
30*y^-1 = x^1
x = 30*y^-1
x = 30*y^-1
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