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