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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/17 = 15/x // - 15/x
8/17-(15/x) = 0
8/17-15*x^-1 = 0
-15*x^-1 = -8/17 // : -15
x^-1 = 8/255
-1 < 0
1/(x^1) = 8/255 // * x^1
1 = 8/255*x^1 // : 8/255
255/8 = x^1
x = 255/8
x = 255/8
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