To solve this expression, we need to perform the operations in the correct order, following the order of operations (PEMDAS/BODMAS).

First, we have the expression (-13/25.5/32.25/-13). To simplify this, we need to divide the numbers from left to right.

(-13/25.5/32.25/-13) = (-0.509803922/32.25/-13)

Next, we have the expression (-0.509803922/32.25/-13) - 64. Again, we need to perform the division first.

(-0.509803922/32.25/-13) = (-0.015803922/-13)

Finally, we have (-0.015803922/-13) - 64. Now we can perform the subtraction.

(-0.015803922/-13) - 64 = 0.001215688 - 64 = -63.998784312

Therefore, the result of the expression (-13/25.5/32.25/-13) - 64 is approximately -63.998784312.