Correct: 20-10=10, 17-6=11, 10+5=15, 9+5=14, 18-9=9, 6+6=12, 7+6=13, 17-8=9, 3+11=14, 14+5=19, Incorrect: 12+5=20, 20-10=5, 17-6=3, 6+7=14, 9+9=20, 9+4=15, 20-6=11, 8+11=18, 3+6=10,

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