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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
266/x = 19 // - 19
266/x-19 = 0
266*x^-1 = 19 // : 266
x^-1 = 1/14
-1 < 0
1/(x^1) = 1/14 // * x^1
1 = 1/14*x^1 // : 1/14
14 = x^1
x = 14
x = 14
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