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t in (-oo:+oo)
-16/15 = (20/3)*t // - (20/3)*t
-((20/3)*t)-16/15 = 0
(-20/3)*t-16/15 = 0
-20/3*t-16/15 = 0 // + 16/15
-20/3*t = 16/15 // : -20/3
t = 16/15/(-20/3)
t = -4/25
t = -4/25
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