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

The equation is $\"\"$

According to addition Property of equality: If a = b then $\"\"$ .

$\"\"$ (Add 9 to each side)

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

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

Check:

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

$\"\"$

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

Compare the values, the equation is true. $\"\"$

The value of $\"\"$ .