\"\"\"\"

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The equation is \"\"

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Apply distributive property: a(b+c) = ab+ac

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\"\"

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\"\"                    (Multiply: \"\")

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\"\"                                                  \"\"

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Apply Subtraction  property of equality: Subtract  10z  from eachside.

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\"\"

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

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

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

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The statement \"\"  is always true. \"\"

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The equation is an identity and the solution set  is all numbers.