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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/x = 25/9 // - 25/9
32/x-(25/9) = 0
32/x-25/9 = 0
32*x^-1 = 25/9 // : 32
x^-1 = 25/288
-1 < 0
1/(x^1) = 25/288 // * x^1
1 = 25/288*x^1 // : 25/288
288/25 = x^1
x = 288/25
x = 288/25
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