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t in (-oo:+oo)
5*t-(7*t)-1 = 13 // - 13
5*t-(7*t)-13-1 = 0
5*t-7*t-13-1 = 0
-2*t-14 = 0 // + 14
-2*t = 14 // : -2
t = 14/(-2)
t = -7
t = -7
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