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t in (-oo:+oo)
(1/2)*t-((4/5)*t)+2/3 = 19/15 // - 19/15
(1/2)*t-((4/5)*t)+2/3-(19/15) = 0
(1/2)*t+(-4/5)*t+2/3-19/15 = 0
-3/10*t-3/5 = 0 // + 3/5
-3/10*t = 3/5 // : -3/10
t = 3/5/(-3/10)
t = -2
t = -2
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