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x in (-oo:+oo)
(3*x)/2 < -6 // + 6
(3*x)/2+6 < 0
3/2*x+6 < 0 // - 6
3/2*x < -6 // : 3/2
x < -6/3/2
x < -4
x in (-oo:-4)
(-oo:-4)
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