-4(-4w-y)-3(y-4w)

-4(-4w-y)-3(y-4w)      distribute the minus 4   over the terms in the first parentheses and the -3 over the terms in the second parentheses

-4(-4w) -4(-y)   -3(y) -3(-4w)  =

16w  + 4y   - 3y   + 12w      combine like terms

16w + 12w + 4y - 3y   =

28w + 1y     or just

28w + y