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t in (-oo:+oo)
(2/3)*t-((1/6)*t) = t-(15/2) // - t-(15/2)
(2/3)*t-((1/6)*t)-t+15/2 = 0
(2/3)*t+(-1/6)*t-t+15/2 = 0
15/2-1/2*t = 0 // - 15/2
-1/2*t = -15/2 // : -1/2
t = -15/2/(-1/2)
t = 15
t = 15
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