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x in (-oo:+oo)
4*x-(12/3) < 4 // - 4
4*x-(12/3)-4 < 0
4*x-4-4 < 0
4*x-8 < 0 // + 8
4*x < 8 // : 4
x < 8/4
x < 2
x in (-oo:2)
(-oo:2)
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