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t in (-oo:+oo)
(4/9)*(18-(9*t)) = 0
(4/9)*(18-9*t) = 0
4/9*(18-9*t) = 0
18-9*t = 0 // - 18
-9*t = -18 // : -9
t = -18/(-9)
t = 2
t = 2
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