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t in (-oo:+oo)
6*(1*t-9) = -12 // + 12
6*(1*t-9)+12 = 0
6*(t-9)+12 = 0
6*(t-9)+12 = 0
6*t-42 = 0
6*t-42 = 0
6*t-42 = 0 // + 42
6*t = 42 // : 6
t = 42/6
t = 7
t = 7
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