$\"\"$

$\"\"$ (Apply Cross products property)

$\"\"$ (Distributive proeperty: a(b + c) = ab + ac) $\"\"$

Apply Addition property of equality; if a = b than a + c = b + c.

$\"\"$ (Add 18 to each side)

$\"\"$ (Additive inverse proerpty: $\"\"$ )

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

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

$\"\"$ (Cancel common terms)

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

The bar indicates repeating decimal.

$\"\"$

The value of $\"\"$ .