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t in (-oo:+oo)
(5/7)*t+3/4 = 61/28 // - 61/28
(5/7)*t+3/4-(61/28) = 0
(5/7)*t+3/4-61/28 = 0
5/7*t-10/7 = 0 // + 10/7
5/7*t = 10/7 // : 5/7
t = 10/7/5/7
t = 2
t = 2
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