\"\"

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Tom and Li-Cheng are solving the equation \"\".

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\"\"      (Original equation)

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  \"\"                (\"\")

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  \"\"                         (Simplify)

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  \"\"                         (\"\")

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   \"\"                             (Mixed fraction)

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Therefore, tom is correct.

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Hence, Li-cheng added  \"\" instead of dividing \"\" by \"\", then she did not follows the order of operation.

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Tom is follow the order of operation.

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\"\"

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Tom is correct.