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t in (-oo:+oo)
5*t-(7*t)+5/7 = 61/7 // - 61/7
5*t-(7*t)+5/7-(61/7) = 0
5*t-7*t+5/7-61/7 = 0
-2*t-8 = 0 // + 8
-2*t = 8 // : -2
t = 8/(-2)
t = -4
t = -4
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