What is the mass balance in complete setup in this backward feed evaporator?

What is the mass balance in complete setup in this backward feed evaporator? Correct Answer F=P1+E3

If we make an enclosing surface for the total setup, we observe only the incoming and outgoing masses, we see Feed F entering, and product P1 and evaporate E3 leaving. Hence the mass balance is F=P1+E3.
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