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z in (-oo:+oo)
(1/4)*z < 2 // - 2
(1/4)*z-2 < 0
1/4*z-2 < 0 // + 2
1/4*z < 2 // : 1/4
z < 2/1/4
z < 8
z in (-oo:8)
(-oo:8)
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