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t in (-oo:+oo)
4-5*t = 16/9 // - 16/9
4-5*t-(16/9) = 0
4-5*t-16/9 = 0
20/9-5*t = 0 // - 20/9
-5*t = -20/9 // : -5
t = -20/9/(-5)
t = 4/9
t = 4/9
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