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t in (-oo:+oo)
(2/9)*t-(5/9) = (1/12)*t // - (1/12)*t
(2/9)*t-((1/12)*t)-(5/9) = 0
(2/9)*t+(-1/12)*t-5/9 = 0
5/36*t-5/9 = 0 // + 5/9
5/36*t = 5/9 // : 5/36
t = 5/9/5/36
t = 4
t = 4
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