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<!DOCTYPE html> <html> <body> <p>x = 10 and y = 5, calculate x -= y, and display x:</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = 10; var y = 5; x -= y; document.getElementById("demo").innerHTML = x; } </script> </body> </html>