The first method is to have what is called a multi-image, which is just a single image that has both equations after the split:
In other words, instead of just visualizing one equation, you visualize both of them. You then do the manipulations for each individually.
Here we did each equation one at a time. If you are good, you can solve both simultaneously.
It is powerful to combine the use of multi-images with windowing. Visualizing several variations of the same equation at once is a lot of work. Because of the similarity, though, it is relatively easy to window them.