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t in (-oo:+oo)
(4/6)*t-((1/6)*t) = t-(21/6) // - t-(21/6)
(4/6)*t-((1/6)*t)-t+21/6 = 0
(4/6)*t+(-1/6)*t-t+21/6 = 0
7/2-1/2*t = 0 // - 7/2
-1/2*t = -7/2 // : -1/2
t = -7/2/(-1/2)
t = 7
t = 7
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