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t in (-oo:+oo)
-(t/5)-5 > -9 // + 9
9-(t/5)-5 > 0
4-1/5*t > 0 // - 4
-1/5*t > -4 // : -1/5
t < -4/(-1/5)
t < 20
t in (-oo:20)
(-oo:20)
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