45 + 3 = 4, 81 - = 37, 2 + 69 = 5, 3 - 4 = 28, - 18 = 24.

45 + 39 = 84, 81 - 44 = 37, 26 + 69 = 95, 73 - 45 = 28, 42 - 18 = 24.