-3x^2 -3x -0.5x +1.5 <0
-3x^2 -3.5x + 1.5 <0
(1x ?) (3x ?) <0
(1x 1.5) (3x 1) <0
(x +1.5) (-3x +1) <0
x + 1.5 < 0 or -3x + 1 < 0
x < -1.5 or -3x < -1
x < -1.5 or 3x > 1
x < -1.5 or x > 1/3
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