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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\28"}</style>
</head>
<body>
  <h1>Left Parenthesis (U+0028)</h1>
  <p>Hex: &#x28;</p>
  <p>Decimal: &#40;</p>
  <p id=point>CSS: </p>
  <p>f&#40;x&#41; = x + 1</p>
</body>
</html>

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HTML Entity for Left Parenthesis (U+0028)