It should be noted that the main idea is the theme of the work and the author can support the main idea by providing information that will enable the readers understand the theme.
Your information is incomplete as you didn't provide the passage. Therefore, an overview will be given. A theme simply means the main idea that's contained in a literary work.
An author can support the main idea by providing information that will enable the readers understand the theme. This is vital to effectively convey the message in the literary work.
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