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