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

The expression is $\"\"$ .

According to subtraction property of equality: Subtract 9 from each side.

$\"\"$ (Subtract 9 from each side)

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

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

Check:

Check the solution by substituting $\"\"$ in the original equation.

$\"\"$

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

The value of $\"\"$ .