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

The expression is $\"\"$ .

Whether the equation is true or not

$\"\"$

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

$\"\"$ (Subtract 6 from each side)

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

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

The equation is true.