6 + 3 = ______, 8 + 5 = ______, 10 + 7 = ______, 9 + 4 = ______, 12 + 6 = ______, 10 − 2 = ______, 14 − 5 = ______, 18 − 7 = ______, 13 − 6 = ______, 20 − 8 = ______.

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