Linear algebra easy question

My textbook does a poor job of explaining of what looks like a simple question.

The question is:

Simplify: 3(2i + 7j - k) - 2(i - 4j)

alright Shawn,
3(2i + 7j - k) - 2(i - 4j) -distributive property
6i + 21j - 3k -(2i - 8j) -distributive property
6i + 21j -3k -2i + 8j -add like terms
4i + 29j - 3k (final answer)

-rajankar is incorrect

4i +13j -3k