$\"\"$

The equation is $\"\"$ .

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

$\"\"$ (Subtract 2 from each side)

$\"\"$ (Apply commutative property: a + b = b + a) \ \ $\"\"$

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

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

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

$\"\"$ (Multiply each side by negative one)

$\"\"$ (Product of two same signs is positive) \ \ $\"\"$

The value of $\"\"$ .