Create better lessons quicker
70 - 20 + 50 =, 100 - 10 + 90 =, 90 - 30 + 60 =, 80 - 40 + 40 =, 60 - 50 + 10 =, 40 - 100 - 60 =, 50 - 70 - 20 =, 30 - 90 - 60 =, 20 - 40 - 20 =, 10 - 70 - 60 =,

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