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t in (-oo:+oo)
31/3 = (1/2)*t // - (1/2)*t
31/3-((1/2)*t) = 0
(-1/2)*t+31/3 = 0
31/3-1/2*t = 0 // - 31/3
-1/2*t = -31/3 // : -1/2
t = -31/3/(-1/2)
t = 62/3
t = 62/3
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