collect like term

12c + 6d -10c - 9d

3 answers

What do you not understand about collecting like terms?
I can't find it in my book at this present time so I was trying to get a example or something. I haven't had Math in about 15 years. Thanks for all your help.
collect like term
12c + 6d -10c - 9d

Like terms are those terms with the same letter.

12c - 10c = 2c
6d - 9d = -3d