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Looks like an Alcea sp., possibly Alcea rosea for me. You can remove it -they're invasive- but they're very wonderful plants too, with giant flower spikes full of very big flowers. They're biennal.
G'Day, I might as well have my 2 bobs worth. It looks like the weed we call "Marsh Mallow" in the same family as those above Malvaceae. Perhaps Malva parviflora.
Brian