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JavaScript statements are separated by semicolons.
var a, b, c; // Declare 3 variables
a = 5; // Assign the value 5 to a
b = 6; // Assign the value 6 to b
c = a + b; // Assign the sum of a and b to c
document.getElementById("demo1").innerHTML = c; // outputs the value of c to HTML element with id "demo1"