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t in (-oo:+oo)
(5/6)*t = -8/9 // + -8/9
(5/6)*t-(-8/9) = 0
(5/6)*t+8/9 = 0
5/6*t+8/9 = 0 // - 8/9
5/6*t = -8/9 // : 5/6
t = -8/9/5/6
t = -16/15
t = -16/15
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