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1) x/29 + 13/29 = 28/29; x/29 = 28/29 - 13/29; x/29 = 15/29 ; x = 15; 2) x/79 + 29/79 = 58/79; x/79 = (58-29)/79 ; x/79 = 29/79 ; x = 29; 3) 52/81 - x/81 = 29/81; x/81 = 52/81 - 29/81; x/81 = 23/81 ; x = 23.