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d in (-oo:+oo)
(1/2)*d < -12 // + 12
(1/2)*d+12 < 0
1/2*d+12 < 0 // - 12
1/2*d < -12 // : 1/2
d < -12/1/2
d < -24
d in (-oo:-24)
(-oo:-24)
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