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3 1
P = 3x(2, -4, 6) + 1x(1, 0, -1)
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3+1
P = (6, -12, 18) + (1, 0, -1)
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4
P = (7/4, -3, 17/4)
PC = C-P
PC = (-2, 5, 4) - (7/4, -3, 17/4)
PC = (-15/4, 8, -1/4)