The response to the request happens to be in the same sentence. This process is continued. Each equation requests some information about a particular quantity. This tells you what to look for among the various conditions given in the problem statement. The steps of the solution unravel the problem statement for you.
Problems solve themselves.
This can be seen quite strikingly if we suppress the words in the solution shown above. Figure 2.2 You will note that each step is a consequence of the previous step and a precursor to the next step. Problems solve themselves. It is valuable to note that at any step the next step does not depend on the previous steps. You are only concerned with where you are going, not with where you have been.