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If '-' stands for '+','+' stands for 'xx...

If '-' stands for '+','+' stands for `'xx','xx'` stands for '-' then which one of the following is not correct ?

A

`22 + 7 - 3 xx 9 = 148`

B

` 33 xx 5-10 + 20 =228`

C

`7 + 28 – 3 xx 52 = 127`

D

`44-9 + 6 xx 11 = 87`

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