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t in (-oo:+oo)
(1/2)*t+8/9 = 79/18 // - 79/18
(1/2)*t+8/9-(79/18) = 0
(1/2)*t+8/9-79/18 = 0
1/2*t-7/2 = 0 // + 7/2
1/2*t = 7/2 // : 1/2
t = 7/2/1/2
t = 7
t = 7
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