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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
6/X = 3/25 // - 3/25
6/X-(3/25) = 0
6/X-3/25 = 0
6*X^-1 = 3/25 // : 6
X^-1 = 1/50
-1 < 0
1/(X^1) = 1/50 // * X^1
1 = 1/50*X^1 // : 1/50
50 = X^1
X = 50
X = 50
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