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t in (-oo:+oo)
47 = 6*t-t+2 // - 6*t-t+2
t-(6*t)-2+47 = 0
t-6*t-2+47 = 0
45-5*t = 0 // - 45
-5*t = -45 // : -5
t = -45/(-5)
t = 9
t = 9
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