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Maybe for a first serious formal introduction to abstract algebra, you could may start downloading the free book by Judson as I think it develops the theory essentials at the right pace and has easy and applied examples and exercises (with hints to solutions).
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Maybe for a first serious formal introduction to abstract algebra, you could start downloading the free book by Judson as I think it develops the theory at the right pace and has easy and applied examples and exercises (with hints to solutions).