The equality is .

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

  (Subtract 5x from each side)

  (Apply commutative property of addition: )

             (Apply additive inverse property:  )

                   (Apply additive identity property:  )

                           (Subtract: )

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

               (Add 5 to each side)

                     (Apply additive inverse property: )

                           (Apply additive identity property: )

                              (Add: )

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

                         (Divide each side by 3)

                              (Cancel common terms)

                                   (Divide: )

Check:

To check, substitute , in .

            (Substitute )

                   (Multiply: )

                         (Subtract: )

                               (Add: )

The equality is true.

The equality solution is .