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t in (-oo:+oo)
7/9 = (1/3)*t // - (1/3)*t
7/9-((1/3)*t) = 0
(-1/3)*t+7/9 = 0
7/9-1/3*t = 0 // - 7/9
-1/3*t = -7/9 // : -1/3
t = -7/9/(-1/3)
t = 7/3
t = 7/3
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