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t in (-oo:+oo)
(2/7)*t = 8/77 // - 8/77
(2/7)*t-(8/77) = 0
(2/7)*t-8/77 = 0
2/7*t-8/77 = 0 // + 8/77
2/7*t = 8/77 // : 2/7
t = 8/77/2/7
t = 4/11
t = 4/11
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