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t in (-oo:+oo)
t+1 = 7*t+67 // - 7*t+67
t-(7*t)-67+1 = 0
t-7*t-67+1 = 0
-6*t-66 = 0 // + 66
-6*t = 66 // : -6
t = 66/(-6)
t = -11
t = -11
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