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t in (-oo:+oo)
(-1/5)*t > 6 // - 6
(-1/5)*t-6 > 0
-1/5*t-6 > 0 // + 6
-1/5*t > 6 // : -1/5
t < 6/(-1/5)
t < -30
t in (-oo:-30)
(-oo:-30)
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