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a = 3i + 2j - k
b = i - 5j + 3k
-------------------------- +
a+b = 4i - 3j + 2k
2 (a + b - 3i)
= 2 (4i - 3j + 2k - 3i)
= 2 (i - 3j + 2k)
= 2i - 6j + 4k ← jawaban
Ok ?