נכון: 6+7=13, 9+9=18, 7+8=15, 5+5=10, 7+9=16, 8+8=16, 6+8=14, 4+5-=9, לא נכון: 9+8=20, 5+6=12, 7+6=11, 5+8=12, 6+9=16, 8+6=15, 6+10=17, 7+4=13,

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