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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 9/6 // - 9/6
8/x-(9/6) = 0
8/x-3/2 = 0
8*x^-1 = 3/2 // : 8
x^-1 = 3/16
-1 < 0
1/(x^1) = 3/16 // * x^1
1 = 3/16*x^1 // : 3/16
16/3 = x^1
x = 16/3
x = 16/3
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