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t in (-oo:+oo)
-3 = 7*t-t-9 // - 7*t-t-9
t-(7*t)-3+9 = 0
t-7*t-3+9 = 0
6-6*t = 0 // - 6
-6*t = -6 // : -6
t = -6/(-6)
t = 1
t = 1
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