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23. ๋‘ ๋ฒกํ„ฐ \(\vec{a} = (k, 3)\), \(\vec{b} = (1, 2)\)์— ๋Œ€ํ•˜์—ฌ \(\vec{a} + 3\vec{b} = (6, 9)\)์ผ ๋•Œ, \(k\)์˜ ๊ฐ’์€? [2์ ]

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