Final answer:
When rewriting subtraction as addition, like terms can be grouped by combining the terms with the same variable and exponent.
Step-by-step explanation:
When rewriting subtraction as addition of the additive inverse, we change the subtraction sign to an addition sign and change the sign of the number being subtracted. For example, 7 - 3 can be rewritten as 7 + (-3).
After rewriting subtraction as addition, like terms can be grouped by combining the terms with the same variable and exponent. For example, in the expression 4x - 2x + 3x, the like terms are 4x, -2x, and 3x. By combining these like terms, we get (4 - 2 + 3)x = 5x.