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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (5000/x)*x^2 // - (5000/x)*x^2
y-((5000/x)*x^2) = 0
y-5000*x = 0
y-5000*x = 0 // - y
-5000*x = -y // : -5000
x = -y/(-5000)
x = y/5000
x = y/5000
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