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t in (-oo:+oo)
(3/4)*t-((5/6)*t) = (2/3)*t // - (2/3)*t
(3/4)*t-((5/6)*t)-((2/3)*t) = 0
(3/4)*t+(-5/6)*t+(-2/3)*t = 0
-3/4*t = 0 // : -3/4
t = 0
t = 0
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