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