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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.412/x = 2 // - 2
0.412/x-2 = 0
0.412*x^-1 = 2 // : 0.412
x^-1 = 4.85436893
-1 < 0
1/(x^1) = 4.85436893 // * x^1
1 = 4.85436893*x^1 // : 4.85436893
0.206 = x^1
x = 0.206
x = 0.206
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