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

The equation is $\"\"$ .

Apply addition property of equality: Add 4ac to each side.

$\"\"$

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

Apply subtraction property of equality: Subtract d from each side.

$\"\"$

Apply commutative property of addition: $\"\"$ .

$\"\"$

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

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

Apply division property of equality: Divide each side by 4a.

$\"\"$

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

The solution is $\"\"$ .