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t in (-oo:+oo)
-28/15 = (16/5)*t // - (16/5)*t
-((16/5)*t)-28/15 = 0
(-16/5)*t-28/15 = 0
-16/5*t-28/15 = 0 // + 28/15
-16/5*t = 28/15 // : -16/5
t = 28/15/(-16/5)
t = -7/12
t = -7/12
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