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= 2 (i + 2j + 3k) + (-3i - 2j - k) - (i- 2j + 3k)
= 2i + 4j + 6k - 3i - 2j - k - i + 2j - 3k
= 2i - 3i - i + 4j - 2j + 2j + 6k - k - 3k
= -2i + 4j + 2k