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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
30 = (9*12)/X // - (9*12)/X
30-((9*12)/X) = 0
30-108*X^-1 = 0
-108*X^-1 = -30 // : -108
X^-1 = 5/18
-1 < 0
1/(X^1) = 5/18 // * X^1
1 = 5/18*X^1 // : 5/18
18/5 = X^1
X = 18/5
X = 18/5
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