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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/12 = 16/x-5 // - 16/x-5
6/12-(16/x)+5 = 0
6/12-16*x^-1+5 = 0
-16*x^-1 = -11/2 // : -16
x^-1 = 11/32
-1 < 0
1/(x^1) = 11/32 // * x^1
1 = 11/32*x^1 // : 11/32
32/11 = x^1
x = 32/11
x = 32/11
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