23 - 20 + 3 = ?, 40 + 5 - 45, 100 + 30 + 2 - 132, 55 - 50 + 5, 200 - 200 + 0 + 0, 60 + 3 - 63, 70 + 4 - 74, 142 - 100 + 40 + 2, 122 - 100 + 20 + 2, 90 + 1 - 91,

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