A javascript function which can balance the values of an equation

Guys, i am a newbie and I hope to get some advice and help on a javascript function which can balance an equation.
Example (n1)x - (n2)y = z, where z === 0.
My current script draf as below:

var z = x * n1 - y * n2;{
  if (n1 < n2){
    x * n1 - n2 = z;
  } else if (n1 > n2){
    n1 - y * n2 = z;
  } else {
    n1 - n2 = z;
  }
}
var balance = function (n1 , n2){
  if (z === 0){
  console.log(x, y);
  } else {
  for (x||y = 0; x||y < 100; x||y++){
    if (z != 0){
    continue;
    }
  console.log(x, y);
  }
}
balance(2,8);

As example I want to balance the value for x and y for 2x - 8y = 0, where 2 > 8, so 2x + 8 = 0 and x will increase to a value which the result will be 0.
For information my current function didn’t work at all and I don’t know what’s the mistake in my script. Can anyone please help me?

How can,

???

2 < 8, sorry for the mistakes, it should become 2x - 8 = 0