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t in (-oo:+oo)
65 = t+7*t+9 // - t+7*t+9
65-t-(7*t)-9 = 0
65-t-7*t-9 = 0
56-8*t = 0 // - 56
-8*t = -56 // : -8
t = -56/(-8)
t = 7
t = 7
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