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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 3.14/1 // - 3.14/1
12/x-(3.14/1) = 0
12/x-3.14 = 0
12*x^-1 = 3.14 // : 12
x^-1 = 0.26166667
-1 < 0
1/(x^1) = 0.26166667 // * x^1
1 = 0.26166667*x^1 // : 0.26166667
3.821656 = x^1
x = 3.821656
x = 3.821656
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