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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/14 = 18/x // - 18/x
11/14-(18/x) = 0
11/14-18*x^-1 = 0
-18*x^-1 = -11/14 // : -18
x^-1 = 11/252
-1 < 0
1/(x^1) = 11/252 // * x^1
1 = 11/252*x^1 // : 11/252
252/11 = x^1
x = 252/11
x = 252/11
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