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t in (-oo:+oo)
641/77 = (-6/7)*t-t+9 // - (-6/7)*t-t+9
t-((-6/7)*t)+641/77-9 = 0
(6/7)*t+t+641/77-9 = 0
13/7*t-52/77 = 0 // + 52/77
13/7*t = 52/77 // : 13/7
t = 52/77/13/7
t = 4/11
t = 4/11
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