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To take the LCD of two farctions, one must take the LCM of its denominators.
The prime factors of 5 is 1 and 5; Of s, is s and 1
Thus, their LCM = 1 x 5 x s = 5s

Thus the LCD of 4/5 and 4/s is 5s.
 The new fractions therefore are:

4s/5s and 20/5s.

So 4s/5s + 20/5s = (4s + 20) / 5s 
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