$\"\"$

The equation is $\"\"$ .

$\"\"$ (Apply distributive property : $\"\"$ )

$\"\"$ (Add $\"\"$ to each side)

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

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

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

$\"\"$

$\"\"$ (Apply distributive property : $\"\"$ )

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms)

$\"\"$ .

$\"\"$

The formula for $\"\"$ is $\"\"$ .