Collecting like terms, simplifying
Students should remember when adding like terms, the coefficients are added the way you add or subtract positive and negative integers. Also, x's to the same power are added to x's to the same power, y's to y's, xy's to xy's, constants (no variable) to constants. Answers will be in descending order.
Remember 6x + 0 is simplified to 6x.
Alabama Standard I-2