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...the petals look about right, although possibly a little more "open" than I would expect: but the leaves don't quite look right, and I would expect more than one single flower per stem.
Will have to wait for someone with more confidence than me, to confirm your ID!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: -51.8347, -58.4537
sewage station Jones Av