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t in (-oo:+oo)
9-5*t = 6*t-123 // - 6*t-123
9-5*t-(6*t)+123 = 0
9-5*t-6*t+123 = 0
132-11*t = 0 // - 132
-11*t = -132 // : -11
t = -132/(-11)
t = 12
t = 12
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