$\"\"$

The equation is $\"\"$ .

Apply subtraction property of equality: subtract b from each side.

$\"\"$

Apply commutative property of addition: a + b = b + a.

$\"\"$

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

Apply division property of equality: Divide each side by d.

$\"\"$

$\"\"$ (Cancel common terms)

$\"\"$ (Multiply each side by negative one)

$\"\"$ (Product of two same signs is positive)

$\"\"$ (Simplify) $\"\"$

The value of $\"\"$ .