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t in (-oo:+oo)
(1/3)*t-(6*t)-6 = -57 // + 57
(1/3)*t-(6*t)-6+57 = 0
(1/3)*t-6*t-6+57 = 0
51-17/3*t = 0 // - 51
-17/3*t = -51 // : -17/3
t = -51/(-17/3)
t = 9
t = 9
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