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t in (-oo:+oo)
6*(1*t+3) = 30 // - 30
6*(1*t+3)-30 = 0
6*(t+3)-30 = 0
6*(t+3)-30 = 0
6*t-12 = 0
6*t-12 = 0
6*t-12 = 0 // + 12
6*t = 12 // : 6
t = 12/6
t = 2
t = 2
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