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t in (-oo:+oo)
4/5-3*t = t+67/15 // - t+67/15
4/5-3*t-t-(67/15) = 0
4/5-3*t-t-67/15 = 0
-4*t-11/3 = 0 // + 11/3
-4*t = 11/3 // : -4
t = 11/3/(-4)
t = -11/12
t = -11/12
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