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2014-01-14T18:59:00+01:00
25/6 x (21/4-13x17/54)  + 35/6             
           21/4-13X17/54)


= 25/6 x (21/4- 221/54) + 35/6
               21/4 - 221/54

= 25/6 x (21x27/4x27 - 221x2/54x2 + 35/6
               21x27/4x27 - 221x2/54x2

= 25/6 x 567/108 - 442/108 + 35/6
              567/108 - 442/108

= 25/6 x 125/108 + 35/6
              125/108

= 25/6 x 1 + 35/6
 
= 25/6 + 35/6

= 60/6

= 60 : 6 / 6 : 6

= 10