How to fix concrete so when it rains it doesn't puddle?

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We have a walkway that is bordered by our house on one side, and a concrete wall on another. The walkway is made of concrete and over time it has settled and has become uneven. When it rains, puddles form in those areas even though we have a bit of a slope in the walkway that goes to a drain. What is the best way to fix the uneven areas?

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