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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
18/100 = 5/X // - 5/X
18/100-(5/X) = 0
18/100-5*X^-1 = 0
-5*X^-1 = -9/50 // : -5
X^-1 = 9/250
-1 < 0
1/(X^1) = 9/250 // * X^1
1 = 9/250*X^1 // : 9/250
250/9 = X^1
X = 250/9
X = 250/9
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