JavaScript Program to Display Sum of Two Numbers

Write a JavaScript program to display sum of two integer numbers.

Source Code
    <title>Addition of Two Numbers</title>
<script type="text/javascript">
    let n1, n2, sum;  // Or var n1, n2, sum;
    n1 = 5;
    n2 = 7;
    sum = n1 + n2;
    document.write("Performing addition of 5 and 7 "+"<br/>");
    document.write("Result = " + sum);

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