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t in (-oo:+oo)
10 < t/(-2) // - t/(-2)
10-(t/(-2)) < 0
1/2*t+10 < 0 // - 10
1/2*t < -10 // : 1/2
t < -10/1/2
t < -20
t in (-oo:-20)
(-oo:-20)
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