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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.2/2.4 = 6/x // - 6/x
3.2/2.4-(6/x) = 0
3.2/2.4-6*x^-1 = 0
-6*x^-1 = -1.33333333 // : -6
x^-1 = 0.22222222
-1 < 0
1/(x^1) = 0.22222222 // * x^1
1 = 0.22222222*x^1 // : 0.22222222
4.50000005 = x^1
x = 4.50000005
x = 4.50000005
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