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t in (-oo:+oo)
(6/7)*t-(2*t)-7 = -587/77 // + -587/77
(6/7)*t-(2*t)-(-587/77)-7 = 0
(6/7)*t-2*t+587/77-7 = 0
48/77-8/7*t = 0 // - 48/77
-8/7*t = -48/77 // : -8/7
t = -48/77/(-8/7)
t = 6/11
t = 6/11
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