2(k-7)-3(5k-1)

2(k - 7) - 3(5k - 1)

Use distributive property

2k - 14 - 15k + 3

Combine like terms (variables first usually)

-13k - 14 + 3

Combine like terms again (now constants)

-13k - 11

And there's your answer

Another excellent answer - thank you Saseflower