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t in (-oo:+oo)
(t^1)/2-((12*t^1)/4)+36 = 0
t/2-3*t+36 = 0
36-5/2*t = 0 // - 36
-5/2*t = -36 // : -5/2
t = -36/(-5/2)
t = 72/5
t = 72/5
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