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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2 = 3.3/x // - 3.3/x
0.2-(3.3/x) = 0
0.2-3.3*x^-1 = 0
-3.3*x^-1 = -0.2 // : -3.3
x^-1 = 0.06060606
-1 < 0
1/(x^1) = 0.06060606 // * x^1
1 = 0.06060606*x^1 // : 0.06060606
16.50000017 = x^1
x = 16.50000017
x = 16.50000017
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