Key learning points

1. When adding or subtracting, terms may only be combined if the order of each variable in each term is the same.
2. The sum of the terms can be thought of as a term, despite being comprised of multiple terms.
3. a + b = c also means that a = c − b
4. a = c − b can also be written as a = c + (−b)

Keywords

• Equation - An equation is used to show two expressions that are equal to each other.

Common misconception