$\"\"$

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

$\"\"$ (Distributive Property: a(b + c) = ab + ac)

$\"\"$ (Substitution property: $\"\"$ )

$\"\"$ (Commutative Property of Addition: a + b = b + a)

$\"\"$ \ \

$\"\"$ (Distributive property: a(b + c) = ab + ac)

$\"\"$ (Substitution property: $\"\"$ )

$\"\"$

The simplified expression is $\"\"$ .