The given equation is .

Distribute terms using distributive property: a (b + c) = ab + ac.

Distribute terms using distributive property: a (b c) = ab ac.

Product of two different sings negative.

Product of two same sings positive.

Combine like terms using distributive property: ab + ac = a (b + c).

Apply subtraction property of equality: If a = b then a c = b c.

Subtract  from each side.

Combine like terms using distributive property: ab ac = a (b c).

Add 28 to each side.

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

Divide each side by 4.

The value of .