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t in (-oo:+oo)
17/5 = 5*t-t+1/5 // - 5*t-t+1/5
t-(5*t)+17/5-(1/5) = 0
t-5*t+17/5-1/5 = 0
16/5-4*t = 0 // - 16/5
-4*t = -16/5 // : -4
t = -16/5/(-4)
t = 4/5
t = 4/5
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