This situation is quite common. The following example illustrates this for a particular case. The following problem is such an example. Yet the solution process is precisely the same as that used in the previous 3 examples. Simply responding in order to the requests made by the starting equation generates the solution.
Problems are self-solving.
Have your students construct problems which have the characteristics of these examples. Their problems will have the same solution structure as that shown in these examples. Also examine textbooks and other instructional materials for problems which have the solution structure shown here. In the examples on this page a concept, a principle or definition, was used to start each solution. The words change, the numbers change and the concepts change but the problem-solving process remains the same.