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t in (-oo:+oo)
1-(7*t) = 78 // - 78
1-(7*t)-78 = 0
1-7*t-78 = 0
-7*t-77 = 0 // + 77
-7*t = 77 // : -7
t = 77/(-7)
t = -11
t = -11
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