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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
112/266 = 8/x // - 8/x
112/266-(8/x) = 0
112/266-8*x^-1 = 0
-8*x^-1 = -8/19 // : -8
x^-1 = 1/19
-1 < 0
1/(x^1) = 1/19 // * x^1
1 = 1/19*x^1 // : 1/19
19 = x^1
x = 19
x = 19
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