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t in (-oo:+oo)
t/(-6) = -2/9 // + -2/9
t/(-6)-(-2/9) = 0
t/(-6)+2/9 = 0
2/9-1/6*t = 0 // - 2/9
-1/6*t = -2/9 // : -1/6
t = -2/9/(-1/6)
t = 4/3
t = 4/3
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