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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 14000/x // - 14000/x
4-(14000/x) = 0
4-14000*x^-1 = 0
-14000*x^-1 = -4 // : -14000
x^-1 = 1/3500
-1 < 0
1/(x^1) = 1/3500 // * x^1
1 = 1/3500*x^1 // : 1/3500
3500 = x^1
x = 3500
x = 3500
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