The equation is .

Apply addition property of equality: Subtract 5 from each side.

     (Add 9 to each side)

               (Apply additive inverse property: )

p = 3                        (Subtract: 4 7 = 3)

Check:

To check the solution, substitute p = 3 in original equation.

4 = 7 + p 4 = 7 3

4 = 4                           (Subtract: 7 3 = 4)

The statement is true.

The value of p = 3.