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t in (-oo:+oo)
3*t-9 = 7*t-1 // - 7*t-1
3*t-(7*t)-9+1 = 0
3*t-7*t-9+1 = 0
-4*t-8 = 0 // + 8
-4*t = 8 // : -4
t = 8/(-4)
t = -2
t = -2
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