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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/2 = 4/x // - 4/x
3/2-(4/x) = 0
3/2-4*x^-1 = 0
-4*x^-1 = -3/2 // : -4
x^-1 = 3/8
-1 < 0
1/(x^1) = 3/8 // * x^1
1 = 3/8*x^1 // : 3/8
8/3 = x^1
x = 8/3
x = 8/3
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