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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/8 = 14/x // - 14/x
11/8-(14/x) = 0
11/8-14*x^-1 = 0
-14*x^-1 = -11/8 // : -14
x^-1 = 11/112
-1 < 0
1/(x^1) = 11/112 // * x^1
1 = 11/112*x^1 // : 11/112
112/11 = x^1
x = 112/11
x = 112/11
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