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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
119/x = 14 // - 14
119/x-14 = 0
119*x^-1 = 14 // : 119
x^-1 = 2/17
-1 < 0
1/(x^1) = 2/17 // * x^1
1 = 2/17*x^1 // : 2/17
17/2 = x^1
x = 17/2
x = 17/2
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