$\"\"$

The width of a rectangle is $\"\"$ and its length is $\"\"$ .

The perimeter of the rectangle is $\"\"$ .

The values of $\"\"$ are substitute in the $\"\"$ .

$\"\"$

Group like terms.

$\"\"$

Combine like terms.

$\"\"$

Apply distributive property: $\"\"$ .

$\"\"$ .

$\"\"$

The perimeter of the rectangle is $\"\"$ .