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x in (-oo:+oo)
x/(-4) > -3 // + 3
x/(-4)+3 > 0
3-1/4*x > 0 // - 3
-1/4*x > -3 // : -1/4
x < -3/(-1/4)
x < 12
x in (-oo:12)
(-oo:12)
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