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t in (-oo:+oo)
(1/2)*t-((5/6)*t)+4 = 107/27 // - 107/27
(1/2)*t-((5/6)*t)-(107/27)+4 = 0
(1/2)*t+(-5/6)*t-107/27+4 = 0
1/27-1/3*t = 0 // - 1/27
-1/3*t = -1/27 // : -1/3
t = -1/27/(-1/3)
t = 1/9
t = 1/9
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