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t in (-oo:+oo)
7-2*t = 67/11 // - 67/11
7-2*t-(67/11) = 0
7-2*t-67/11 = 0
10/11-2*t = 0 // - 10/11
-2*t = -10/11 // : -2
t = -10/11/(-2)
t = 5/11
t = 5/11
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