$\"\"$

The function is $\"f$ .

$\"minus$ (Substitute $\"minus$ )

Apply subtraction property of equality: If a = b then $\"\"$ .

$\"minus$ (Subtract 1 from each side)

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

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

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

Apply division property of equality: If a = b then $\"\"$ .

$\"Syntax$ (Divide each side by negative 3)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ ) $\"\"$

The value of x is 6.