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t in (-oo:+oo)
(6/7)*t-(4/7) = 4/77 // - 4/77
(6/7)*t-(4/7)-(4/77) = 0
(6/7)*t-4/7-4/77 = 0
6/7*t-48/77 = 0 // + 48/77
6/7*t = 48/77 // : 6/7
t = 48/77/6/7
t = 8/11
t = 8/11
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