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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(3/5)/X = 10/9 // - 10/9
(3/5)/X-(10/9) = 0
(3/5)/X-10/9 = 0
3/5*X^-1 = 10/9 // : 3/5
X^-1 = 50/27
-1 < 0
1/(X^1) = 50/27 // * X^1
1 = 50/27*X^1 // : 50/27
27/50 = X^1
X = 27/50
X = 27/50
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