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

The expression is $\"\"$

$\"\"$ (Distribute 5)

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

$\"\"$ (Distribute 5)

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

$\"\"$ (Multiply: $\"\"$ ) $\"\"$ $\"\"$ (Distribute n)

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

The simplified expression is $\"\"$ .