Poprawnie: 2+2=4, 5-3=2, 7-3=4, 10+5=15, 8-3=5, 12-4=8, 10-8=2, 5+8=13, 11+8=19, 20-5=15, 8+3=11, 12+3=15, Niepoprawnie: 2+2=5, 5-3=3, 7-4=2, 10+5=13, 8-3=2, 12-4=5, 10-8=8, 5+8=10, 11+8=20, 20-5=14, 8+3=15, 12+3=18,

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