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t in (-oo:+oo)
(-1/5)*t > 8 // - 8
(-1/5)*t-8 > 0
-1/5*t-8 > 0 // + 8
-1/5*t > 8 // : -1/5
t < 8/(-1/5)
t < -40
t in (-oo:-40)
(-oo:-40)
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