simplify 12*c+13*b+12*a
12*c+13*b+12*a factor the 12 out of each term
12 ( c + b + a) and that's all we can do.....
CPhill: The middle term is "13b", or do you think that is a typo.
Ah, yes...I mis-read it...the correct answer should be..... 12 ( a + c) + 13 b
