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D( X )
3*X = 0
12*X = 0
3*X = 0
3*X = 0
3*X = 0 // : 3
X = 0
12*X = 0
12*X = 0
12*X = 0 // : 12
X = 0
X in (-oo:0) U (0:+oo)
5/(12*X)-6/(3*X) = 19 // - 19
5/(12*X)-6/(3*X)-19 = 0
-19/12*X^-1 = 19 // : -19/12
X^-1 = -12
-1 < 0
1/(X^1) = -12 // * X^1
1 = -12*X^1 // : -12
-1/12 = X^1
X = -1/12
X = -1/12
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