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t in (-oo:+oo)
(4/5)*t > -8 // + 8
(4/5)*t+8 > 0
4/5*t+8 > 0 // - 8
4/5*t > -8 // : 4/5
t > -8/4/5
t > -10
t in (-10:+oo)
(-10:+oo)
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