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

The equation is $\"\"$ .

Apply addition property of equality: Add y to each side.

$\"\"$

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

$\"\"$

$\"\"$ (Apply Additive inverse property: $\"\"$ )

$\"\"$ (Apply Additive identity property: $\"\"$ ) $\"\"$

The value of $\"\"$ .