The expression is .

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

          (Add 8 to each side)

                      (Additive inverse property: )

n = 13                          (Add: 5 + 8 = 13)

Check:

To check the solution Substitute the value of n = 13 in above expression.

5 = 5                                  (Subtract: )

The value of n = 13

By the number line n = 13