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