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t in (-oo:+oo)
7-2*t = 77/9 // - 77/9
7-2*t-(77/9) = 0
7-2*t-77/9 = 0
-2*t-14/9 = 0 // + 14/9
-2*t = 14/9 // : -2
t = 14/9/(-2)
t = -7/9
t = -7/9
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