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t in (-oo:+oo)
-5*t-(7*t)-5 = -77 // + 77
77-5*t-(7*t)-5 = 0
77-5*t-7*t-5 = 0
72-12*t = 0 // - 72
-12*t = -72 // : -12
t = -72/(-12)
t = 6
t = 6
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