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t in (-oo:+oo)
4/9-(5*t) = 449/99 // - 449/99
4/9-(5*t)-(449/99) = 0
4/9-5*t-449/99 = 0
-5*t-45/11 = 0 // + 45/11
-5*t = 45/11 // : -5
t = 45/11/(-5)
t = -9/11
t = -9/11
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