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Hello, here are 6 problems already solved, but I am not sure of my answers and procedures, could you help me review them and see

Hello, here are 6 problems already solved, but I am not sure of my answers and procedures, could you help me review them and see if any of them are wrong. If there is something wrong, could you help me solve the problem to see where I went wrong, thank you.

https://drive.google.com/file/d/1bVr2swzLle9XyA7fME9xHeSpJe1FIRaF/view?usp=sharing

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