____ + 90 + 3 = 493 - 400, 800 + ____+ 3 = 893 - 90, 700 + ____ + 7 = 777 - 70, 400 + ____ = 430 - 30, 600 + ____ = 603 - 3, ____ + 20 = 520 - 500, 600 + ____ + 8 = 628 - 20, 900 + ____ + 1 = 951 - 50, ____ + 8 = 408 - 400, 200 + ____ + 4= 234 - 30,

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