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t in (-oo:+oo)
(4/7)*t+6/7 = 38/35 // - 38/35
(4/7)*t+6/7-(38/35) = 0
(4/7)*t+6/7-38/35 = 0
4/7*t-8/35 = 0 // + 8/35
4/7*t = 8/35 // : 4/7
t = 8/35/4/7
t = 2/5
t = 2/5
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