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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y/48 = 64/x // - 64/x
Y/48-(64/x) = 0
Y/48-64*x^-1 = 0
-64*x^-1 = -(1/48*Y) // : -64
x^-1 = 1/3072*Y
-1 < 0
1/(x^1) = 1/3072*Y // * x^1
1 = 1/3072*Y*x^1 // : 1/3072*Y
3072*Y^-1 = x^1
x = 3072*Y^-1
x = 3072*Y^-1
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