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(2 - 7)/(2 - lambda) = (6 + t - 4)/(12 - 4 lambda) = (3 + t (lambda - 3) - (-1))/(4)
(2 - 7)/(2 - lambda) = (6 + t - 4)/(12 - 4 lambda) = (3 + t (lambda - 3) - (-1))/(4)
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