The equality is .

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

   (Apply additive inverse property:  )

         (Apply additive identity property:  )

               (Sustract: )

Apply Addition property of  equality: Add y to each side.

   (Apply commutative property of addition: a + b = b + a)

            (Apply additive inverse property: )

                  (Apply additive identity property: )

                        (Add: )

Apply division property of equality: Divide each side by 6.

                         (Cancel commen terms)

                              (Divide: )

                    (Multiply each side by negative one)

                             (Product of two same signs is positive)

Check:

To check, substitute , in ,

        (Substitute )

                (Multiply: )

                            (Add: )

The equality is true. \ \

The equality solution is .