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t in (-oo:+oo)
(2/5)*t = 14/15 // - 14/15
(2/5)*t-(14/15) = 0
(2/5)*t-14/15 = 0
2/5*t-14/15 = 0 // + 14/15
2/5*t = 14/15 // : 2/5
t = 14/15/2/5
t = 7/3
t = 7/3
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