Final answer:
In both argumentative and expository texts, the author presents a main idea; in argumentative texts, it's the claim, and in expository texts, it's the thesis statement, with both being supported by evidence.
Step-by-step explanation:
The author's claim in an argumentative/persuasive text is analogous to the thesis statement or controlling idea in an expository/informative text. In an argumentative text, an author makes a specific claim that the text argues is true, often derived from the thesis statement, whereas in an informative text, the controlling idea functions similarly by stating the main topic or point that the author intends to communicate. Both the claim in an argumentative text and the thesis statement in an informative text guide the direction of the content and are supported through evidence and analysis.