The exponent is .

Since base is common, apply the product of powers property: .

\ \ \ \       ()

Since the base is common to equate the exponents.

         (Subtract 5 from each side)

      (Apply commutative property: )

           (Apply additive inverse property: )

                 (Apply additive identity property: )

                   (Subtract: )

     (Multiply each side by negative one)

                         (Product of two same signs is negative)

The missing term is 5.