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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.58/x = 0.15/0.3 // - 0.15/0.3
0.58/x-(0.15/0.3) = 0
0.58/x-0.5 = 0
0.58*x^-1 = 0.5 // : 0.58
x^-1 = 0.86206897
-1 < 0
1/(x^1) = 0.86206897 // * x^1
1 = 0.86206897*x^1 // : 0.86206897
1.15999999 = x^1
x = 1.15999999
x = 1.15999999
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