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t in (-oo:+oo)
t+6*t+4/7 = 445/7 // - 445/7
t+6*t+4/7-(445/7) = 0
t+6*t+4/7-445/7 = 0
7*t-63 = 0 // + 63
7*t = 63 // : 7
t = 63/7
t = 9
t = 9
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