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So the statement of the problem is "Find x such that the galvanometer shows zero deflection." The answer to the problem according to the source is $x = 3.33m$.

So I assumed the cells 10V and 6V are in series as the same current flows through the part II of the circuit. But I got the wrong answer. But if I give the same cells in part II of the circuit a series treatment I get the right answer. I am confused, the same current flows through the cells, shouldn't they be in series and not in parallel? How do I get the equivalent emf in the part II of the circuit so as to find x where potentiometer will show no deflection?

Here's my work on it;

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