\"\"\"\"

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The inequality is \"\".

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Apply addition property of inequality: Add 6 to each side.

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\"\"\"\" \"\"      (Commutative property: a+b=b+a)                   

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\"\"            (Add:\"\")   

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\"\"                  (Additive inverse property:\"\")

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\"\"                        (Additive identity property: \"\")

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\"\"

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\"\"       (Subtract 3b from each side )

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\"\"                (Subtract:\"\")

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\"\"                           (Additive inverse property:\"\")

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\"\"

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\"\"          (Subtract 21 from each side )

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\"\"          (Commutative property: a+b=b+a)

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\"\"             (Subtract:\"\")

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\"\"                        (Additive inverse property:\"\")

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\"\"                              (Additive identity property: \"\")

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\"\"

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\"\"                         (Divide each side by 21)

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

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\"\"                                     (Cancel common terms )

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\"\"              

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Graph the Solution set on a number line

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\"number

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 (Note: A dot means that this point is included in the solution set)        \"\"

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The solution set is \"\".