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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/4 = 12/x // - 12/x
9/4-(12/x) = 0
9/4-12*x^-1 = 0
-12*x^-1 = -9/4 // : -12
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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