$\"\"$ $\"\"$

The expression is $\"\"$ .

$\"\"$ (Useing distributive property: $\"\"$ )

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

Apply subtraction property of equality: Subtract 8n from each side.

$\"\"$

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Additive identity property: $\"\"$ )

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

The value of expression is $\"\"$ .