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t in (-oo:+oo)
6*(1-(1*t)) = -6 // + 6
6*(1-(1*t))+6 = 0
6*(1-t)+6 = 0
6*(1-t)+6 = 0
12-6*t = 0
12-6*t = 0
12-6*t = 0 // - 12
-6*t = -12 // : -6
t = -12/(-6)
t = 2
t = 2
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