Final answer:
To simplify the expression 67c - 59d - 12c - 13d, combine the like terms to get 55c - 72d.
Step-by-step explanation:
To simplify the expression 67c - 59d - 12c - 13d, we can combine the like terms. Like terms are terms that have the same variables and exponents. In this case, the like terms are 67c and -12c, as well as -59d and -13d.
Combining the like terms, we have (67c - 12c) - (59d + 13d) = 55c - 72d.
So, the simplified expression is
55c - 72d