\"Subtraction\"\"

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The equation is a \"\"(\"\"12) = 6.

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a + 12 = 6                 (Product of two opposite signs is positive)

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Apply subtraction property of equality: Subtract 12 from each side.

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a + 12\"\"12 = 6\"\"12

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a + 0 = 6\"\"12           (Apply additive inverse property: 12\"\"12 = 0)

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a = \"\"6                     (Apply additive identity property: a + 0 = a)

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a = \"\"6                     (Subtract: 6\"\"12= \"\"6)\"\"

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Check:

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To check the solution, substitute a = \"\"6 in original equation.

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a + 12 = 6\"\"\"\"6 + 12 = 6

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6 = 6                              (Add: \"\"6 + 12 = 6)

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The statement is true.\"\"

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The value of a = \"\"6.