multiply and combine like terms

5(3x-2y) - (x+6y)

First distribute the 5:

5(3x-2y)-(x+6y) will become (15x-10y) -(x+6y)
Then, distribute the - on the (x+6y):
15x-10y-x-6y
Then, just combine the x's and y's and you'll end up with:
14x-16y