you will need to remove the metal cap in the centre of the drum to get to the large hub nut. undo it & the drum should then pull straight off. but if the brake friction material has come away from the shoe,(which is a very common problem on these), it can make it difficult to get off & it won't help any if there is a wear ridge around the edge of the drum. try pulling & wriggling it off,or if that fails try brut force.
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