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t in (-oo:+oo)
(4/5)*t-((1/3)*t)+1/3 = 19/15 // - 19/15
(4/5)*t-((1/3)*t)+1/3-(19/15) = 0
(4/5)*t+(-1/3)*t+1/3-19/15 = 0
7/15*t-14/15 = 0 // + 14/15
7/15*t = 14/15 // : 7/15
t = 14/15/7/15
t = 2
t = 2
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