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t in (-oo:+oo)
(4/5)*t+7*t-2/7 = 2447/35 // - 2447/35
(4/5)*t+7*t-2/7-(2447/35) = 0
(4/5)*t+7*t-2/7-2447/35 = 0
39/5*t-351/5 = 0 // + 351/5
39/5*t = 351/5 // : 39/5
t = 351/5/39/5
t = 9
t = 9
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