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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/4 = 10/X // - 10/X
5/4-(10/X) = 0
5/4-10*X^-1 = 0
-10*X^-1 = -5/4 // : -10
X^-1 = 1/8
-1 < 0
1/(X^1) = 1/8 // * X^1
1 = 1/8*X^1 // : 1/8
8 = X^1
X = 8
X = 8
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