How can I set a value of a variable, as if it were an equation?
In this case I will have:
var a = document.body.scrollWidth;
var b = 500;
var x = null;
What I need to do is find a number such that a - x = b , regardless of the size of a
If someone also needed to know this, I thank Eduen Sarceño, you just calculate:
var x = document.body.scrollWidth - 500;
That will give me the value of " scrollWidth " of the body minus 500, which then having that variable, I can subtract it from body , to give me 500