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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.646/x = 0.29 // - 0.29
0.646/x-0.29 = 0
0.646*x^-1 = 0.29 // : 0.646
x^-1 = 0.44891641
-1 < 0
1/(x^1) = 0.44891641 // * x^1
1 = 0.44891641*x^1 // : 0.44891641
2.2275862 = x^1
x = 2.2275862
x = 2.2275862
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