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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/27 = 16/x // - 16/x
14/27-(16/x) = 0
14/27-16*x^-1 = 0
-16*x^-1 = -14/27 // : -16
x^-1 = 7/216
-1 < 0
1/(x^1) = 7/216 // * x^1
1 = 7/216*x^1 // : 7/216
216/7 = x^1
x = 216/7
x = 216/7
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