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t in (-oo:+oo)
(5*t)/9 = 4/8 // - 4/8
(5*t)/9-(4/8) = 0
(5*t)/9-1/2 = 0
5/9*t-1/2 = 0 // + 1/2
5/9*t = 1/2 // : 5/9
t = 1/2/5/9
t = 9/10
t = 9/10
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