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x in (-oo:+oo)
(4*x)/8 < -12 // + 12
(4*x)/8+12 < 0
1/2*x+12 < 0 // - 12
1/2*x < -12 // : 1/2
x < -12/1/2
x < -24
x in (-oo:-24)
(-oo:-24)
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