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t in (-oo:+oo)
78 = t+7*t-10 // - t+7*t-10
10-t-(7*t)+78 = 0
10-t-7*t+78 = 0
88-8*t = 0 // - 88
-8*t = -88 // : -8
t = -88/(-8)
t = 11
t = 11
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