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q = 4i - j + 3k
2p - 3q
2(-3i + j - 2k) - 3 (4i - j + 3k)
(-6i + 2j - 4k) - (12i - 3j + 9k)
-6i + 2j - 4k - 12i + 3j - 9k
- 18i + 5j - 13k