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t in (-oo:+oo)
(4/7)*t+4 = 160/7-t // - 160/7-t
(4/7)*t+t-(160/7)+4 = 0
(4/7)*t+t-160/7+4 = 0
11/7*t-132/7 = 0 // + 132/7
11/7*t = 132/7 // : 11/7
t = 132/7/11/7
t = 12
t = 12
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