The equation is 64 = 4r.

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

                (Divide each side by negative 4)

                     (Cancel common terms)

r = 8                           (Divide: )

Check:

To check the solution, substitute r = 8 in original equation.

64=  (8)(4)

64 = 64                         (Multiply: )

The statement is true.

The value of r = 8.