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t in (-oo:+oo)
(1/3)*t-4/9 = 8/9 // - 8/9
(1/3)*t-4/9-(8/9) = 0
(1/3)*t-4/9-8/9 = 0
1/3*t-4/3 = 0 // + 4/3
1/3*t = 4/3 // : 1/3
t = 4/3/1/3
t = 4
t = 4
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