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t in (-oo:+oo)
t-4 = 6*t-9 // - 6*t-9
t-(6*t)-4+9 = 0
t-6*t-4+9 = 0
5-5*t = 0 // - 5
-5*t = -5 // : -5
t = -5/(-5)
t = 1
t = 1
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