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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
66/x = 3/2 // - 3/2
66/x-(3/2) = 0
66/x-3/2 = 0
66*x^-1 = 3/2 // : 66
x^-1 = 1/44
-1 < 0
1/(x^1) = 1/44 // * x^1
1 = 1/44*x^1 // : 1/44
44 = x^1
x = 44
x = 44
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