$\"\"$

The equation is $\"\"$ .

Subtract 9 from each side.

$\"\"$

Divide each side by 3.

$\"\"$

Cancel common terms.

$\"\"$ . $\"\"$

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

$\"\"$

$\"\"$ .

This statement is true, so the solution of equation is 4 . $\"\"$

The value of $\"\"$ .