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Add Like Terms, If Possible, and Write the Result in Descending

Question 176

Multiple Choice

Add like terms, if possible, and write the result in descending powers of the variable.
-7y9 + 7y7 - 7y4 + 2


A) 7y20 + 2
B) 7y9 + 7y7 - 7y4
C) 9y20
D) Cannot be simplified

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