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<!DOCTYPE html> <html> <body> <h1>JavaScript Assignment</h1> <h2>Addition Assignment</h2> <h2>The += Operator</h2> <p>x = 10 and y = 5, calculate x += y:</p> <p id="demo"></p> <script> let x = 10; let y = 5; x += y; document.getElementById("demo").innerHTML = "Value of x is: " + x; </script> </body> </html>
