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t in (-oo:+oo)
1-(2*t) = 7*t-71 // - 7*t-71
1-(2*t)-(7*t)+71 = 0
1-2*t-7*t+71 = 0
72-9*t = 0 // - 72
-9*t = -72 // : -9
t = -72/(-9)
t = 8
t = 8
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