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2014-02-12T18:58:21+01:00
A=-1-(2+12) =-1-14 =-15 B= 4-(9+15-8) = 4- (24-8) = 4- 16 = -12 C= 5x9 = 45 D= 2x6-7 = 12-7 = 5 E= 5x9 = 45