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t in (-oo:+oo)
(2/5)*t = 10/25 // - 10/25
(2/5)*t-(10/25) = 0
(2/5)*t-2/5 = 0
2/5*t-2/5 = 0 // + 2/5
2/5*t = 2/5 // : 2/5
t = 2/5/2/5
t = 1
t = 1
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