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In your Solutions to Pinters a Book of Abstract Algebra Chapter 8 Exercise H3 i can...

In your Solutions to Pinters a Book of Abstract Algebra Chapter 8 Exercise H3 i can not understand in step 5 you get (ab)(cd)=(dac)(abd). Can you show me in some detail how to get that result please?

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Need a summary of chapter 8 of book ' Good to great'
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