5+7, 12-5, 9+6, 15-9, 8+4, 12-8, 8+8, 16-8, 7+7, 14-7, 9+9, 18-9, 10+6, 16-6, 6+6, 5+5, 12-6, 10-5, 11-6, 6+5, 12+3, 18+2, 20-10, 30-20, 15+5, 9+3, 12-9, 13-7, 7+6, 8+7.

Math addition and subtraction

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