$\"\"$

The given measures are $\"\"$ .

From the diagram $\"\"$ are corresponding angles.

So, when the measures are equal then the lines m and n are parallel.

$\"\"$ (Set measures equal)

$\"\"$ (Divide each side by 6)

$\"\"$ (Cancel common terms)

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

The value of $\"\"$ .