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t in (-oo:+oo)
(4/5)*t-(3/10) = 2/5 // - 2/5
(4/5)*t-(3/10)-(2/5) = 0
(4/5)*t-3/10-2/5 = 0
4/5*t-7/10 = 0 // + 7/10
4/5*t = 7/10 // : 4/5
t = 7/10/4/5
t = 7/8
t = 7/8
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