\"\"

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Given that \"\".

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Pre image \"\"

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\"\"         (Substitute \"\")

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\"\"               (The mod \"\")

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\"\"            (Multiply each side by 5)

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\"\"                (Multiply: \"\")

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\"\"                   (Divide each side by 2)

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\"\"                      (Divide: \"\")\"\"

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The pre image is \"\".