Answer:
1)D
2)A
Step-by-step explanation:
1)[tex]-7a-2x+5a-6x\\-7a+5a-2x-6x\\-2a-8x[/tex]
The last choice is the correct answer.
2)
[tex]16bc-8ab=8b(2c-a)[/tex]
The answer is the first choice
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