If 'A' means '+', 'B' means '-', 'C' means '÷' and 'D' means '×', then which of the following equation is correct?

1
5D14C28A12 = (–2)
2
22D2C4A11 = 33
3
56C28D17B36 = (–2)
4
14D2B18A19 = 6

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