MODERATE EXERCISES - Symbol Manipulation

(5) Rewrite each fraction as a sum or difference.
  
 (a) t2 - st
    ----------
       40t 
   
 (b) ky + (k - 1)x
    ---------------
          xy

 (c)  -7 + (x/2)
     ------------
          x

		

HINT: 
 
 For each question, recall that:
       ab + ac  =  ab  +  ac  =  b  +  c
      ---------   ----   ----   ---   ---
         ad        ad     ad     d     d

  

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