$\"\"$

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The equation is $\"\"$ .

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Rewrite the original equation $\"\"$ .

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Apply cross product property: $\"\"$ .

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$\"\"$

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$\"\"$

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Distribute terms using distributive property: $\"\"$ .

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$\"\"$

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$\"\"$

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Apply subtraction property of equality: If a = b then $\"\"$ .

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Subtract $\"\"$ from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Add 6 to each side.

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$\"\"$

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$\"\"$

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Divide each side by negative four.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ .