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t in (-oo:+oo)
6 = 7*t-5*t-8 // - 7*t-5*t-8
6-(-5*t)-(7*t)+8 = 0
5*t-7*t+6+8 = 0
14-2*t = 0 // - 14
-2*t = -14 // : -2
t = -14/(-2)
t = 7
t = 7
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