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t in (-oo:+oo)
(1/2)*t > 8 // - 8
(1/2)*t-8 > 0
1/2*t-8 > 0 // + 8
1/2*t > 8 // : 1/2
t > 8/1/2
t > 16
t in (16:+oo)
(16:+oo)
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