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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
25/1 = 15/X // - 15/X
25/1-(15/X) = 0
25-15*X^-1 = 0
-15*X^-1 = -25 // : -15
X^-1 = 5/3
-1 < 0
1/(X^1) = 5/3 // * X^1
1 = 5/3*X^1 // : 5/3
3/5 = X^1
X = 3/5
X = 3/5
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