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t in (-oo:+oo)
-54 = 5*t+t-6 // - 5*t+t-6
6-(5*t)-t-54 = 0
6-5*t-t-54 = 0
-6*t-48 = 0 // + 48
-6*t = 48 // : -6
t = 48/(-6)
t = -8
t = -8
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