An equation with one unknown, called the missing term, which is either of the two terms or their sum.

### Examples

In each of the equations below, the unknown is represented by a \(□\).

- \(7 + □ = 12\)
- \(□ + 5 = 12\)
- \(7 + 5 = □\)

An equation with one unknown, called the missing term, which is either of the two terms or their sum.

In each of the equations below, the unknown is represented by a \(□\).

- \(7 + □ = 12\)
- \(□ + 5 = 12\)
- \(7 + 5 = □\)