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t in (-oo:+oo)
(6/7)*t-((2/3)*t)+1/7 = 19/77 // - 19/77
(6/7)*t-((2/3)*t)+1/7-(19/77) = 0
(6/7)*t+(-2/3)*t+1/7-19/77 = 0
4/21*t-8/77 = 0 // + 8/77
4/21*t = 8/77 // : 4/21
t = 8/77/4/21
t = 6/11
t = 6/11
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