\"\"\"\"

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The equation is  \"\".

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Apply Substration property of equality: subtract 9 to each side.

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\"\"

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\"\"

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\"\"                  According to Additive inverse property: \"\".

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 \"\"                    (subtract:\"\"\"\"

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Check:

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To check, substitute less than -6 in \"\"

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\"\"                   (Subtract: \"\")

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\"\"                                    \"\"

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The inequality \"\" is true for a=-7 \ \