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t in (-oo:+oo)
t/(-2) = 0.5 // - 0.5
t/(-2)-0.5 = 0
-1/2*t-0.5 = 0 // + 0.5
-1/2*t = 0.5 // : -1/2
t = 0.5/(-1/2)
t = -1
t = -1
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