Could someone explain me how this code works line to line? Thanks.

Question

var X=10;
var x=7;
var c=5;
var z=(x*x)-(x);
document.write(X-x);
document.write(z);

Answer 1

z = 7*7 -7 = 49-7 = 42
X-x = 10-7 = 3
output: 342

Tips: I'm seeing that you have posted number of questions of this kind. You can easily trace your code by printing the variables on each step, it helps a lot. Good day :)