$\"\"$

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The equation is $\"\"$ .

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According to subtraction property of equality: a = b then $\"\"$ .

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

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(Apply commutative property of addition: a + b = b + a)

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$\"\"$

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

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$\"\"$ (Apply additive identity property: $\"\"$ )

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

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According to multiplication property of equality: a = b then $\"\"$ .

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$\"\"$ (Multiply each side by negative 2)

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$\"\"$ (Product of two same signs is positive)

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$\"\"$ (Cancel common terms) \ \

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

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The value of $\"\"$ .