Question 1204169
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Edwin,  even although some problems are easier to setup using more than one unknown,


it does not necessary mean that it is easier to  SOLVE  them using more than one unknown.



So,  it may happen,  that the setup is easier this way,  but the solution is harder.



From this point of view,  it is unclear for what position do you fight - and  WHY.



There are many problems, that can be stupidly considered as for three unknowns,
but smartly and elegantly solved using only one unknown - I solved many such problems at this forum.



Isn't it is better to develop students' mind to be flexible enough (when possible), 
in order for they be able to seek their best approaches to their problems ?