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y in (-oo:+oo)
(1/2)*y-5 < 7 // - 7
(1/2)*y-7-5 < 0
1/2*y-12 < 0 // + 12
1/2*y < 12 // : 1/2
y < 12/1/2
y < 24
y in (-oo:24)
(-oo:24)
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