The way you wrote it, using no parentheses at all, the PEMDAS rule 
says that you mean this:

÷

where we do the division ÷ first, then change it
to multiplication by the reciprocal of the second as ×
where when we cancel we get 
So we replace the ÷ by  and now we have:



and the LCD is 80, so we have



We add the numerators and put it over the LCD as

 or 

------------------------------------------------------

But you may have forgotten about parentheses and ignored the PEMDAS rule 
and meant this instead:

÷

If so we get LCD of 16 on the left and right

÷

÷

We know that when we divide a number by itself we get 1

or we can invert the second and multiply:

×

and after canceling, we get 1.

So if you ignored PEMDAS and parentheses, the answer is 1.

Edwin