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t in (-oo:+oo)
1-(7*t) = t-63 // - t-63
1-(7*t)-t+63 = 0
1-7*t-t+63 = 0
64-8*t = 0 // - 64
-8*t = -64 // : -8
t = -64/(-8)
t = 8
t = 8
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