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

The equation is $\"\"$

Apply subtraction property of equality: Subtract 6 from each side.

$\"\"$

$\"\"$ (Apply Additive inverse proparty: $\"\"$ )

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

$\"\"$ (Divide each side by 3)

$\"\"$ (Cancel common terms) $\"\"$

Check:

To check the solution, substitute $\"\"$ in original equation.

$\"\"$

$\"\"$ (Cancel common terms)

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

Compare the values, the equation is true.

$\"\"$

The value of $\"\"$ .