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t in (-oo:+oo)
-28/3 = (-5/4)*t // - (-5/4)*t
-((-5/4)*t)-28/3 = 0
(5/4)*t-28/3 = 0
5/4*t-28/3 = 0 // + 28/3
5/4*t = 28/3 // : 5/4
t = 28/3/5/4
t = 112/15
t = 112/15
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