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t in (-oo:+oo)
(2/5)*t = 12/25 // - 12/25
(2/5)*t-(12/25) = 0
(2/5)*t-12/25 = 0
2/5*t-12/25 = 0 // + 12/25
2/5*t = 12/25 // : 2/5
t = 12/25/2/5
t = 6/5
t = 6/5
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