Math 521 #135: Algebra Manipulation and integer solution

This is an easy and routine question in Math Olympiad. It is also a good exercise for anyone not involving in Math Olympiad.

Please have a good try.

Please give it a try before looking at the answer and explanation.

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A math problem will be solved and discussed on every TUESDAY. These problems are suitable for math enthusiasts, it helps in learning and sharpening skills in math Olympiad skill too.

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