$\"\"$

The expression is $\"\"$ .

Rearrange the terms using the distributive property: $\"\"$ .

$\"\"$ (Distribute 3y)

Apply commutative property of multiplication: $\"\"$ .

$\"\"$

Apply associative property of multiplication: $\"\"$

$\"\"$

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

The simplified expression is $\"\"$