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t in (-oo:+oo)
-15/8 = (9/2)*t // - (9/2)*t
-((9/2)*t)-15/8 = 0
(-9/2)*t-15/8 = 0
-9/2*t-15/8 = 0 // + 15/8
-9/2*t = 15/8 // : -9/2
t = 15/8/(-9/2)
t = -5/12
t = -5/12
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