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t in (-oo:+oo)
(4/7)*t+2*t-6 = -354/77 // + -354/77
(4/7)*t+2*t-(-354/77)-6 = 0
(4/7)*t+2*t+354/77-6 = 0
18/7*t-108/77 = 0 // + 108/77
18/7*t = 108/77 // : 18/7
t = 108/77/18/7
t = 6/11
t = 6/11
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