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x in (-oo:+oo)
x/(-6) > 3/2 // - 3/2
x/(-6)-(3/2) > 0
x/(-6)-3/2 > 0
-1/6*x-3/2 > 0 // + 3/2
-1/6*x > 3/2 // : -1/6
x < 3/2/(-1/6)
x < -9
x in (-oo:-9)
(-oo:-9)
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