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t in (-oo:+oo)
(4/5)*t-1 = 5*t // - 5*t
(4/5)*t-(5*t)-1 = 0
(4/5)*t-5*t-1 = 0
-21/5*t-1 = 0 // + 1
-21/5*t = 1 // : -21/5
t = 1/(-21/5)
t = -5/21
t = -5/21
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