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

The expression is $\"\"$ .

Group like terms using commutative property of addition: a + b = a + b.

$\"\"$

Combine like terms using distributive property: $\"\"$ .

$\"\"$

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

Combine like terms using distributive property: $\"\"$ .

$\"\"$

$\"\"$ (Add: $\"\"$ ) $\"\"$

The simplified expression is $\"\"$ .