If You know how to Combine Like Fractions or know of a site where I can plug in problems and get tips and how to do them then PLEASE help me!

9)-2(c-d) + (c-d) - 6(c-d)

10)-3(4x + -2y) - 2(x+3y) -2(2x+6y)

These are two problems I need hints on just to randomly pick!