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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 14/6 // - 14/6
8/x-(14/6) = 0
8/x-7/3 = 0
8*x^-1 = 7/3 // : 8
x^-1 = 7/24
-1 < 0
1/(x^1) = 7/24 // * x^1
1 = 7/24*x^1 // : 7/24
24/7 = x^1
x = 24/7
x = 24/7
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