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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/27 = 64/x // - 64/x
24/27-(64/x) = 0
24/27-64*x^-1 = 0
-64*x^-1 = -8/9 // : -64
x^-1 = 1/72
-1 < 0
1/(x^1) = 1/72 // * x^1
1 = 1/72*x^1 // : 1/72
72 = x^1
x = 72
x = 72
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