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t in (-oo:+oo)
t/(-5) > -0.5 // + 0.5
t/(-5)+0.5 > 0
0.5-1/5*t > 0 // - 0.5
-1/5*t > -0.5 // : -1/5
t < -0.5/(-1/5)
t < 2.5
t in (-oo:2.5)
(-oo:2.5)
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