$\"\"$

\

The expression is $\"\"$ .

\

Apply horizontal method.

\

Apply distributive property: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

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

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

The simplified expression is $\"\"$ .