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2b = 2(3i - 2k) = 6i - 4k
3c = 3(2j - 5k) = 6j - 15k
a - 2b - 3c = 2i + 3j + k - (6i - 4k) - (6j - 15k)
= 2i + 3j + k - 6i + 4k - 6j + 15k
= (2 - 6)i + (3 - 6)j + (1+4+15)k
= -4i - 3j + 20k
2b = 2 (3i-2k) = 6i-4k
3c = 3 (2j-5k) = 6j-15k
a-2b-3c = (2i+3j+k) - (6i-4k) - (6j-15k)
= -4i - 3j +20k