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t in (-oo:+oo)
(2/5)*t-t+7/8 = 241/440 // - 241/440
(2/5)*t-t+7/8-(241/440) = 0
(2/5)*t-t+7/8-241/440 = 0
18/55-3/5*t = 0 // - 18/55
-3/5*t = -18/55 // : -3/5
t = -18/55/(-3/5)
t = 6/11
t = 6/11
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