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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2 = 15500/x // - 15500/x
0.2-(15500/x) = 0
0.2-15500*x^-1 = 0
-15500*x^-1 = -0.2 // : -15500
x^-1 = 0.0000129
-1 < 0
1/(x^1) = 0.0000129 // * x^1
1 = 0.0000129*x^1 // : 0.0000129
77519.37984496 = x^1
x = 77519.37984496
x = 77519.37984496
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