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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
48/X = 50/25 // - 50/25
48/X-(50/25) = 0
48/X-2 = 0
48*X^-1 = 2 // : 48
X^-1 = 1/24
-1 < 0
1/(X^1) = 1/24 // * X^1
1 = 1/24*X^1 // : 1/24
24 = X^1
X = 24
X = 24
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