For the circuit shown in figure, choose the correct statement(s) ?

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conservation of charge in system-1
5 (y – 0) + 10 (y – 20) + 10 [(y + 20) – 20] + 5 [(y + 20) – (–10)] = 0
conservation of charge in system - 2
5 [ (x + 20) – 0] + 10 [(x + 20) – 10] + 5 [x – 10] + 10 [x – (– 10)] = 0
2N = 10 ⇒ N = 5