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

The equation is $\"\"$ .

Apply addition Property of equality: Add 9 to each side.

$\"\"$

$\"\"$ (Apply additive inverse property: $\"\"$ )

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

Check:

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

$\"\"$

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

Compare the values, the equation is true.

$\"\"$

The value of $\"\"$ .