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z in (-oo:+oo)
(1/2)*z < 7 // - 7
(1/2)*z-7 < 0
1/2*z-7 < 0 // + 7
1/2*z < 7 // : 1/2
z < 7/1/2
z < 14
z in (-oo:14)
(-oo:14)
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