$\"\"$

The expression is $\"\"$ .

$\"\"$ (Multiply by reciprocal)

$\"\"$ (Use rule for multiplying fractions)

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

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

$\"\"$ (Write difference of numerators over denominator)

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

The simplified expression is $\"\"$ .