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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 6000/x // - 6000/x
y-(6000/x) = 0
y-6000*x^-1 = 0
-6000*x^-1 = -y // : -6000
x^-1 = y/6000
-1 < 0
1/(x^1) = y/6000 // * x^1
1 = x^1*(y/6000) // : y/6000
6000*y^-1 = x^1
x = 6000*y^-1
x = 6000*y^-1
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