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

The expression is $\"\"$ \ \ $\"\"$ (Distributive Property: $\"\"$ )

$\"\"$ (Substitution Property: $\"\"$ )

$\"\"$ (Commutative Property of Addition: $\"\"$ )

$\"\"$

$\"\"$ (Associative Property of Addition)

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

$\"\"$ (Substitution Property: $\"\"$ )

$\"\"$

The simplified expression is $\"\"$ . \ \