\"\"\"\"

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The equation is \"\".

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\"\"                       (Product of two different signs is negative)

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Apply addition property of equality: Add 18 to each side.

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\"\"

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\"\"                       (Apply additive inverse property: \"\")

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\"\"                              (Add: \"\")\"\"

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Check:

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

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\"\"

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

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Compare the values, the equation is true.

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\"\"

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The value of d is \"\". \ \