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t in (-oo:+oo)
(1/3)*t+1/3 = (4/7)*t-(6/7) // - (4/7)*t-(6/7)
(1/3)*t-((4/7)*t)+1/3+6/7 = 0
(1/3)*t+(-4/7)*t+1/3+6/7 = 0
25/21-5/21*t = 0 // - 25/21
-5/21*t = -25/21 // : -5/21
t = -25/21/(-5/21)
t = 5
t = 5
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