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Answer 1

Answer:

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Step-by-step explanation:

42asq. - 8a (a-1) -7a(1+5a)+a(a-1)

42asq. -8asq.+ 8a-7a-35asq.+asq.-a

42asq.+asq.-8asq.-35asq.+8a-7a-a

43asq.-43asq.+8a-8a

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