If $x@y=xy-2x$, what is the value of $(7@4)-(4@7)$?
Question:
If $x@y=xy-2x$, what is the value of $(7@4)-(4@7)$?
Answer:
Let's think step by step.

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If $x@y=xy-2x$, what is the value of $(7@4)-(4@7)$?
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