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

The given funtion is $\"\"$ and $\"\"$

Compare the above two equations.

We get,

$\"\"$

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

$\"\"$

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

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

According to division property of equality: Divide each side by 6.

$\"\"$

$\"\"$ (Cancel common terms) $\"\"$

The value of $\"\"$ .