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t in (-oo:+oo)
(-1/2)*t > 4 // - 4
(-1/2)*t-4 > 0
-1/2*t-4 > 0 // + 4
-1/2*t > 4 // : -1/2
t < 4/(-1/2)
t < -8
t in (-oo:-8)
(-oo:-8)
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