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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = 4/8 // - 4/8
16/x-(4/8) = 0
16/x-1/2 = 0
16*x^-1 = 1/2 // : 16
x^-1 = 1/32
-1 < 0
1/(x^1) = 1/32 // * x^1
1 = 1/32*x^1 // : 1/32
32 = x^1
x = 32
x = 32
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