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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = 56/38.5 // - 56/38.5
16/x-(56/38.5) = 0
16/x-1.45454545 = 0
16*x^-1 = 1.45454545 // : 16
x^-1 = 0.09090909
-1 < 0
1/(x^1) = 0.09090909 // * x^1
1 = 0.09090909*x^1 // : 0.09090909
11.00000011 = x^1
x = 11.00000011
x = 11.00000011
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