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t in (-oo:+oo)
(2/9)*t = 5/6 // - 5/6
(2/9)*t-(5/6) = 0
(2/9)*t-5/6 = 0
2/9*t-5/6 = 0 // + 5/6
2/9*t = 5/6 // : 2/9
t = 5/6/2/9
t = 15/4
t = 15/4
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