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t in (-oo:+oo)
t/(-6) = -2/7 // + -2/7
t/(-6)-(-2/7) = 0
t/(-6)+2/7 = 0
2/7-1/6*t = 0 // - 2/7
-1/6*t = -2/7 // : -1/6
t = -2/7/(-1/6)
t = 12/7
t = 12/7
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