Respuesta :

Answer:

9( x - y)

Explanation:

7x - 8y + 2x - y

= 7x + 2x - ( 8y + y)

= 9x - 9y

= 9(x - y)

Done :))

Answer: 9x-7y
Explanation :
7x+2x =9x
-8y-y = -7y
Then put together
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