$\"\"$

The expression is $\"\"$ .

Simplify the expression.

$\"\"$ (Original expression)

$\"\"$ (Definition of negative exponents: $\"\"$ )

Definition of exponents: $\"\"$

$\"\"$

$\"\"$ (Divide out common factors)

$\"\"$ (Simplify)

$\"\"$ .

$\"\"$

The simplified expression is $\"\"$ .