$\"\"$

\

The statement is “ $\"\"$ ”.

\

$\"\"$ (Apply commutative property of addition: $\"\"$ )

\

Apply associative property of addition: $\"\"$ .

\

$\"\"$

\

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

\

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

\

The sum is $\"\"$ .