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t in (-oo:+oo)
7-6*t = 2*t-65 // - 2*t-65
7-6*t-(2*t)+65 = 0
7-6*t-2*t+65 = 0
72-8*t = 0 // - 72
-8*t = -72 // : -8
t = -72/(-8)
t = 9
t = 9
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