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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/18 = 96/x // - 96/x
12/18-(96/x) = 0
12/18-96*x^-1 = 0
-96*x^-1 = -2/3 // : -96
x^-1 = 1/144
-1 < 0
1/(x^1) = 1/144 // * x^1
1 = 1/144*x^1 // : 1/144
144 = x^1
x = 144
x = 144
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