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t in (-oo:+oo)
(3/7)*t-1 = 10/7 // - 10/7
(3/7)*t-(10/7)-1 = 0
(3/7)*t-10/7-1 = 0
3/7*t-17/7 = 0 // + 17/7
3/7*t = 17/7 // : 3/7
t = 17/7/3/7
t = 17/3
t = 17/3
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