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1) 17/31 + x/31 = 26/31; x/31 = 26/31 - 17/31; x/31 = 9/31 ; x = 9; 2) x/89 + 27/89 = 54/89; x/89 = 54/89 - 27/89; x/89 = 27/89 ; x = 27; 3) 53/96 - x/96 = 27/96; x/96 = 53/96 - 27/96; x/96 = 26/96 ; x = 26.