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t in (-oo:+oo)
(8/10)*t-(4/10) = 4/10 // - 4/10
(8/10)*t-(4/10)-(4/10) = 0
(8/10)*t-2/5-2/5 = 0
4/5*t-4/5 = 0 // + 4/5
4/5*t = 4/5 // : 4/5
t = 4/5/4/5
t = 1
t = 1
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