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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x-(16/x)-8-8 = 0
(2*x)/x-16*x^-1-8-8 = 0
-16*x^-1 = 14 // : -16
x^-1 = -7/8
-1 < 0
1/(x^1) = -7/8 // * x^1
1 = -7/8*x^1 // : -7/8
-8/7 = x^1
x = -8/7
x = -8/7
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