twenty - 15 + 5 =, zero - 18 -18 =, twelve - 15 - 3 =, thirteen - 7 + 6 =, fifteen - 20 - 5 =, nine - 11 - 2 =, eighteen - 9 +9 =, eleven - 6 + 5 =, fourteen - 7 x 2 =, sixteen - 8 x 2 =,

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