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The equation is 

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

              (Add 4p to each side)

              (Apply commutative property)

                                      (Add: )

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According to subtraction property of equality: If a = b then a – c = b – c.

                           (Subtract 5 from each side)

                                             (Subtract: )

                                        (Divide each side by 5)

                                             (Cancel common terms)

                                                  (Cancel common terms)

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Verify:

To check the solution, substitute  in original equation.   

                                      (Multiply:)

                                                     (Subtract:: Add:)

Compare the values, the equation is true. The solution is .

   The value of