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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9.2/x = 2.3/16 // - 2.3/16
9.2/x-(2.3/16) = 0
9.2/x-0.14375 = 0
9.2*x^-1 = 0.14375 // : 9.2
x^-1 = 0.015625
-1 < 0
1/(x^1) = 0.015625 // * x^1
1 = 0.015625*x^1 // : 0.015625
64 = x^1
x = 64
x = 64
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