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$\"\"$

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The statement is “ $\"\"$ ”

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$\"\"$ (Commutative property of addition: $\"\"$ )

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$\"\"$ (Add: - 6 – 4 = -10)

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$\"\"$ (Associative property of addition: $\"\"$ )

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

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

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$\"\"$

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The simplified expression is -20.

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