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t in (-oo:+oo)
(5/6)*t = 10/21 // - 10/21
(5/6)*t-(10/21) = 0
(5/6)*t-10/21 = 0
5/6*t-10/21 = 0 // + 10/21
5/6*t = 10/21 // : 5/6
t = 10/21/5/6
t = 4/7
t = 4/7
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