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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
9/90 = 23/X // - 23/X
9/90-(23/X) = 0
9/90-23*X^-1 = 0
-23*X^-1 = -1/10 // : -23
X^-1 = 1/230
-1 < 0
1/(X^1) = 1/230 // * X^1
1 = 1/230*X^1 // : 1/230
230 = X^1
X = 230
X = 230
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