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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
256/9.6 = 1.6/x // - 1.6/x
256/9.6-(1.6/x) = 0
256/9.6-1.6*x^-1 = 0
-1.6*x^-1 = -26.66666667 // : -1.6
x^-1 = 16.66666667
-1 < 0
1/(x^1) = 16.66666667 // * x^1
1 = 16.66666667*x^1 // : 16.66666667
0.06 = x^1
x = 0.06
x = 0.06
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