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t in (-oo:+oo)
6*(t+9) = 126 // - 126
6*(t+9)-126 = 0
6*(t+9)-126 = 0
6*t-72 = 0
6*t-72 = 0
6*t-72 = 0 // + 72
6*t = 72 // : 6
t = 72/6
t = 12
t = 12
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