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

The expression is $\"\"$ .

$\"\"$ (Distributive property: $\"\"$ )

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

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

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

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

The solution of $\"\"$ is $\"\"$ .