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t in (-oo:+oo)
(1/4)*t-(4/5) = 13/40-(2*t) // - 13/40-(2*t)
(1/4)*t+2*t-(4/5)-(13/40) = 0
(1/4)*t+2*t-4/5-13/40 = 0
9/4*t-9/8 = 0 // + 9/8
9/4*t = 9/8 // : 9/4
t = 9/8/9/4
t = 1/2
t = 1/2
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