$\"\"$

The expression is $\"\"$ .

$\"\"$ can be written as $\"\"$

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Apply commutative property of multiplication: $\"\"$ ) $\"\"$

$\"\"$ (The product of two different signs is negative)

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

$\"\"$ (Divide: $\"\"$ ) $\"\"$

The solution is $\"\"$ .