private key for a secret code"1983"?

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Hi !! I tried to find information and examples to solve this RSA cryptography with public and private keys problem but couldn't find it.. This is my preparation questions for exam and not assignment.Could someone explain the steps to solve this problem? And, any resource with related examples like this? cheers!!

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Here is what i did. However, I used wolfram alpha to calculate inverse 5 mod(1008) to find value of d but any ideas how can i do it using calculator or manually in exam? cheers!!