OK, terms are separated by a plus or minus sign, so your terms are 20x and 13.
The coefficient is the number before the variable, so your coefficient is 20 (if no coefficient, like x, then the coefficient is 1).
The constant is the term with no variables (making it constant), so your constant is 13.
So, take x - 1245. Your terms are x and -1245. The coefficient is 1, and the constant is -1245.
Hooe this helps!
