Adjustments after sprocket change

[webbmeister25d]

So, I noted the location of each axle bracket against the indentations on the swing arms before I loosened things up to go for the larger front sprocket. They were not equal. The new front sprocket is now on, and the chain tension is good, but the axle placement from right to left is still unequal. What method do you all use to ensure the rear tire is in line with the front tire when you adjust your chain tension? Was my bike just poorly adjusted to begin with? Should I be aiming to make the axle brackets line up with the same indentations or spaces between indentations on the swing arm - the idea being to get both sides of the axle equidistant from the front of the swing arm? I guess I'm asking how to do a rear end alignment?

Thanks!

Jim