$\"\"$ $\"\"$ $\"\"$

The equation is $\"\"$

According to multiplication property of equality:

For any number a, b and c, If a = b then a.c = b.c

$\"\"$ (Multiply each side by n)

$\"\"$ (Cancel common terms)

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

According to division property of equality:

For any number a, b and c, If a = b then $\"\"$

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

$\"\"$ (Cancel common terms)

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

The value of n = 9.