$\"\"$

\

The expression is $\"\"$ .

\

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

\

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

\

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

\

$\"\"$ (Write $\"\"$ using LCM)

\

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

\

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

\

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

\

The simplified expression is $\"\"$ .