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