$\"\"$

The equation is $\"\"$ .

Apply addition property of equality: If $\"\"$ then $\"\"$ .

Add 18 to each side.

$\"\"$

$\"\"$ .

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

$\"\"$

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

The solution $\"\"$ .