$\"\"$

The expression is $\"\"$ .

$\"\"$ (Distributive property: $\"\"$ )

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

$\"\"$ (Product of two different signs is negative)

$\"\"$ (Commutative property: a + b = b + a)

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

The simplified expression of $\"\"$ $\"\"$ .