[-7]и[3]

It seems you might be indicating an interval or a range using square brackets. The expression \([-7] \text{ and } [3]\) typically suggests the inclusion of the endpoints -7 and 3.

If you want to express the interval containing all numbers from -7 to 3, it can be written as:

\[-7, 3\]

This notation means that both -7 and 3 are included in the interval. If you meant something else, please clarify!