Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>A typical arithmetic operation takes two numbers (or variables) and produces a new number.</p>

<p id="demo"></p>

<script>
var a = 100;
var b = 50;
var x = a + b;
document.getElementById("demo").innerHTML = x;
</script>

</body>
</html>