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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(-2/(-9))/X = 14/5 // - 14/5
(-2/(-9))/X-(14/5) = 0
(-2/(-9))/X-14/5 = 0
2/9*X^-1 = 14/5 // : 2/9
X^-1 = 63/5
-1 < 0
1/(X^1) = 63/5 // * X^1
1 = 63/5*X^1 // : 63/5
5/63 = X^1
X = 5/63
X = 5/63
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