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t in (-oo:+oo)
7*t+4/7 = 191/77 // - 191/77
7*t+4/7-(191/77) = 0
7*t+4/7-191/77 = 0
7*t-21/11 = 0 // + 21/11
7*t = 21/11 // : 7
t = 21/11/7
t = 3/11
t = 3/11
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