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t in (-oo:+oo)
5*t+7 = 7*t+1 // - 7*t+1
5*t-(7*t)-1+7 = 0
5*t-7*t-1+7 = 0
6-2*t = 0 // - 6
-2*t = -6 // : -2
t = -6/(-2)
t = 3
t = 3
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