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D( U )
U = 0
U = 0
U = 0
U in (-oo:0) U (0:+oo)
6/U = -9 // + 9
6/U+9 = 0
6*U^-1 = -9 // : 6
U^-1 = -3/2
-1 < 0
1/(U^1) = -3/2 // * U^1
1 = -3/2*U^1 // : -3/2
-2/3 = U^1
U = -2/3
U = -2/3
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