$\"\"$

The equation is $\"\"$ .

Apply subtraction property of equality: If $\"\"$ then $\"\"$ .

Subtract m from each side.

$\"\"$

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

$\"\"$

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

$\"\"$ .

The value of $\"\"$ is called additive inverse of m, since $\"\"$ . $\"\"$

The value of $\"\"$ is called additive inverse of m.