Answer: Yes with possible slight variation A main idea is more general, while a concept is more specific. For example in an essay about child labour you could say the main concept is child labor, but the main idea is how to combat child labor.
Explanation:
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The cost of 20 pencil is 16
Brutus was the only one who true believed killing Caesar would help their country. He did not do it for power, he did it for his country.