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t in (-oo:+oo)
(-4*t)/5 = 1.28 // - 1.28
(-4*t)/5-1.28 = 0
-4/5*t-1.28 = 0 // + 1.28
-4/5*t = 1.28 // : -4/5
t = 1.28/(-4/5)
t = -1.6
t = -1.6
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