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

The expression is $\"\"$ .

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

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

$\"\"$

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

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

$\"\"$ (Add: 27 + 15 = 42)

$\"\"$

The simplified expression is $\"\"$ .