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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 14/3 // - 14/3
18/x-(14/3) = 0
18/x-14/3 = 0
18*x^-1 = 14/3 // : 18
x^-1 = 7/27
-1 < 0
1/(x^1) = 7/27 // * x^1
1 = 7/27*x^1 // : 7/27
27/7 = x^1
x = 27/7
x = 27/7
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