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x in (-oo:+oo)
(1/2)*(8*x-12) < 14 // - 14
(1/2)*(8*x-12)-14 < 0
1/2*(8*x-12)-14 < 0
1/2*(8*x-12)-14 < 0
4*x-20 < 0
4*x-20 < 0
4*x-20 < 0 // + 20
4*x < 20 // : 4
x < 20/4
x < 5
(-oo:5) (5:+oo) 4*x-20 - +
x in (-oo:5)
(-oo:5)
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