The expression is .

Apply subtraction property of equality: Subtract 4 from each side.

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

           (Apply additive inverse property: )

                   (Subtract: )

Apply division property of equality: Divide each side by negative 3.

                   (Cancel common terms)

                     (Divide: )

Case 1: If a = b,Then

Case 2: If a = b, Then

                          (Product of two same signs is positive)

Graph the solution on a number line.

The equality solution set is {2 or 2}.