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

The expression is $\"\"$ .

$\"\"$ (Distributive property: a(b + c) = ab + ac)

$\"\"$ (Multiply: $\"\"$ )

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

$\"\"$ (Add: $\"\"$ ) $\"\"$

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

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

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

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

The solution of expression is wrong.