I was working with some middle school teachers-to-be who are noticing some of the aspects of algebra we tend to take for granted after years of practice and application, and they are noticing how difficult it can be to anticipate the strategies and struggles of students who are just learning algebra.

One way I get around that is to try to hold myself still with a problem for a bit and look for the hidden connections. With kids, I might tell them we're looking for the
Hidden Wows.
Suppose I am preparing a lesson for sixth graders to introduce
problems of this form:
Solve: ax = b
My planning might start out sounding a bit like this: