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t in (-oo:+oo)
(2/3)*t+4/9 = 28/27 // - 28/27
(2/3)*t+4/9-(28/27) = 0
(2/3)*t+4/9-28/27 = 0
2/3*t-16/27 = 0 // + 16/27
2/3*t = 16/27 // : 2/3
t = 16/27/2/3
t = 8/9
t = 8/9
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