Hi there,
BeeBop's reply was basically the same as superposition.
Superposition states that the response at any point in a linear circuit
is equal to the sum of the responses from each source acting alone.
To get a circuit with each source acting alone we have to do what
BeeBop said, or a little simpler, 'kill' all sources and then 'unkill' them
one at a time and take the response for the node or branch we are
after, then after we have done this for each source we add the results.
To 'kill' a voltage source we short it out, and to 'kill' a current source
we open circuit it. To 'unkill' either we simply put it back the way it was.
Note that after we 'unkill' a source we have to 'kill' it again before unkilling
the next source. There should never be more than one source acting
in the circuit at a time as we go through all the sources one by one.
I agree for this circuit using Thev and Norton might be a little simpler
than superposition, but one has to be very careful to get all the
algebraic signs right for each step or the result gets badly skewed.