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2013-03-01T11:43:16+01:00

a) x-15/12=16/12    b) x+49/21=15/21   c) x-60/96=24/96   d) 3/9-x=-2/9 

   x=16/15                   x=-15/49                      x=24/60                  x=-2/-3

                                                                          x=0.4                       x=2/3