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t in (-oo:+oo)
t-(7*t)-5 = 7 // - 7
t-(7*t)-7-5 = 0
t-7*t-7-5 = 0
-6*t-12 = 0 // + 12
-6*t = 12 // : -6
t = 12/(-6)
t = -2
t = -2
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