$\"\"$

The statement is “ $\"\"$ ”

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

Associative property of addition:

The way in which numbers are grouped when added does not change the sum.

For any numbers a, b and c; $\"\"$ .

According to associative property, the statement can be written as

$\"\"$

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

The simplified expression is $\"\"$ .