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t in (-oo:+oo)
(6/7)*t-1 = -17/21 // + -17/21
(6/7)*t-(-17/21)-1 = 0
(6/7)*t+17/21-1 = 0
6/7*t-4/21 = 0 // + 4/21
6/7*t = 4/21 // : 6/7
t = 4/21/6/7
t = 2/9
t = 2/9
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