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t in (-oo:+oo)
(2/3)*t+2/7 = 206/231 // - 206/231
(2/3)*t+2/7-(206/231) = 0
(2/3)*t+2/7-206/231 = 0
2/3*t-20/33 = 0 // + 20/33
2/3*t = 20/33 // : 2/3
t = 20/33/2/3
t = 10/11
t = 10/11
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