5 lines of simple Python solution


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    P

    '''
    index_iterate = range(len(nums)-1)
    index_iterate = index_iterate[::-1]

        for index in index_iterate:
            # Check if the prev. element has same value as this
            if nums[index+1] == nums[index]:
                del nums[index+1]
                
        return len(nums)
    

    '''


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