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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 16/x-3 // - 16/x-3
8/x-(16/x)+3 = 0
8/x-16*x^-1+3 = 0
-8*x^-1 = -3 // : -8
x^-1 = 3/8
-1 < 0
1/(x^1) = 3/8 // * x^1
1 = 3/8*x^1 // : 3/8
8/3 = x^1
x = 8/3
x = 8/3
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