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