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z in (-oo:+oo)
(3/4)*z-(3/8) < 1/4 // - 1/4
(3/4)*z-(3/8)-(1/4) < 0
(3/4)*z-3/8-1/4 < 0
3/4*z-5/8 < 0 // + 5/8
3/4*z < 5/8 // : 3/4
z < 5/8/3/4
z < 5/6
z in (-oo:5/6)
(-oo:5/6)
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