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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 src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>