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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3/X = 2/30 // - 2/30
3/X-(2/30) = 0
3/X-1/15 = 0
3*X^-1 = 1/15 // : 3
X^-1 = 1/45
-1 < 0
1/(X^1) = 1/45 // * X^1
1 = 1/45*X^1 // : 1/45
45 = X^1
X = 45
X = 45
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