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t in (-oo:+oo)
(t^1)/2-((8*t^1)/4)-15 = 0
t/2-2*t-15 = 0
-3/2*t-15 = 0 // + 15
-3/2*t = 15 // : -3/2
t = 15/(-3/2)
t = -10
t = -10
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