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t in (-oo:+oo)
t/(-6) = -4/(-9) // + -4/(-9)
t/(-6)-(-4/(-9)) = 0
t/(-6)-4/9 = 0
-1/6*t-4/9 = 0 // + 4/9
-1/6*t = 4/9 // : -1/6
t = 4/9/(-1/6)
t = -8/3
t = -8/3
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