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