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

The expression is $\"\"$

Whether the equation is true or not

$\"\"$

According to subtraction property of equality: if $\"\"$ , then $\"\"$ .

$\"\"$ (Subtract 12 from each side)

$\"\"$ (Commutative property: a + b = b + a)

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

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

$\"\"$

The equation is true.