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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 2.30702 // - 2.30702
12/x-2.30702 = 0
12*x^-1 = 2.30702 // : 12
x^-1 = 0.19225167
-1 < 0
1/(x^1) = 0.19225167 // * x^1
1 = 0.19225167*x^1 // : 0.19225167
5.20151528 = x^1
x = 5.20151528
x = 5.20151528
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