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x in (-oo:+oo)
(1/2)*(x-8) < 2 // - 2
(1/2)*(x-8)-2 < 0
1/2*(x-8)-2 < 0
1/2*(x-8)-2 < 0
1/2*x-6 < 0
1/2*x-6 < 0
1/2*x-6 < 0 // + 6
1/2*x < 6 // : 1/2
x < 6/1/2
x < 12
(-oo:12) (12:+oo) 1/2*x-6 - +
x in (-oo:12)
(-oo:12)
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