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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/100 = 5000/x // - 5000/x
4/100-(5000/x) = 0
4/100-5000*x^-1 = 0
-5000*x^-1 = -1/25 // : -5000
x^-1 = 1/125000
-1 < 0
1/(x^1) = 1/125000 // * x^1
1 = 1/125000*x^1 // : 1/125000
125000 = x^1
x = 125000
x = 125000
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