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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/9 = 16/x // - 16/x
X/9-(16/x) = 0
X/9-16*x^-1 = 0
-16*x^-1 = -(1/9*X) // : -16
x^-1 = 1/144*X
-1 < 0
1/(x^1) = 1/144*X // * x^1
1 = 1/144*X*x^1 // : 1/144*X
144*X^-1 = x^1
x = 144*X^-1
x = 144*X^-1
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