First you must distribute the 3 to the numbers inside the parentheses, which would be 5c and -17...
2 + (3 * 5c) + (3 *(-17))
2 + 15c + (-51)
2 + 15c - 51
Now you must combine like terms. Like terms are numbers that have matching variables OR are numbers with out variables. In this case the like terms are 2 and -51, since they both don't have variables
