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t in (-oo:+oo)
(3/7)*t-2*t-6 = -108/7 // + -108/7
(3/7)*t-2*t-(-108/7)-6 = 0
(3/7)*t-2*t+108/7-6 = 0
66/7-11/7*t = 0 // - 66/7
-11/7*t = -66/7 // : -11/7
t = -66/7/(-11/7)
t = 6
t = 6
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