SOLUTION: (21+17)+____ =21+(17+5)
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Algebra: Distributive, associative, commutative properties, FOIL
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Question 279885
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(21+17)+____ =21+(17+5)
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checkley77(12844)
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(21+17)+____ =21+(17+5)
38+X=21+22
X=43-38
X=5 ANS.
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