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t in (-oo:+oo)
(4/5)*t+t-1 = 67/5 // - 67/5
(4/5)*t+t-(67/5)-1 = 0
(4/5)*t+t-67/5-1 = 0
9/5*t-72/5 = 0 // + 72/5
9/5*t = 72/5 // : 9/5
t = 72/5/9/5
t = 8
t = 8
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