13 - Find the difference: 18-5, 17 - Find the sum: 12+5, 6 - Find the difference: 14-8, 18 - Find the sum: 9+9, 9 - Find the difference between 11 and 2 , 16 - Find the sum of 7 and 9 , 12 - Find the difference between 19 and 7, 20 - Find the sum of 12and 8, 7 - Find the difference between twelve and five, 19 - Find the sum of eight and eleven,

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