$\"\"$

The statement is “ $\"\"$ ”

$\"\"$ (Substitute $\"\"$ ) \ \

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

$\"\"$ (Add: $\"\"$ ) $\"\"$ $\"\"$ (Apply associative property of addition: $\"\"$ )

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

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

The simplified expression is $\"\"$ .