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t in (-oo:+oo)
(1/6)*t-t+3 = 58/21 // - 58/21
(1/6)*t-t-(58/21)+3 = 0
(1/6)*t-t-58/21+3 = 0
5/21-5/6*t = 0 // - 5/21
-5/6*t = -5/21 // : -5/6
t = -5/21/(-5/6)
t = 2/7
t = 2/7
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