Final answer:
The main focus of these sections in the 'Purposeful Argument' text is the editing focus which includes mixed sentence constructions, pronoun clarity, commonly confused words, and aspects like characterization and point of view, verb tense, and subject-verb agreement, along with the writer's intent to engage with conventional expectations rhetorically.
Step-by-step explanation:
The main focus of Chapter 7, sections 7-6 to 7-8, in the Purposeful Argument text appears to center around various aspects of editing focus. These sections discuss how a writer's text adheres to specific grammatical and stylistic guidelines such as mixed sentence constructions, clear use of pronouns, words often confused, characterization and point of view, verb tense consistency, and subject-verb agreement.
In addition to adherence to these rules, there is a recurring theme of the writer's intent to meet or challenge conventional expectations in rhetorically effective ways. Furthermore, the text consistently emphasizes the importance of maintaining grammatical consistency throughout its various sections.