Question: 2. (10 points) Consider a minimum cost network flow problem over the network below: 3 8 2 Suppose that the supplies at each node are

2. (10 points) Consider a minimum cost network
2. (10 points) Consider a minimum cost network flow problem over the network below: 3 8 2 Suppose that the supplies at each node are as follows: node 1 2 3 4 supply 20 -200 100 120 5 100-140 6 7 8 9 20 20 -40 Note that a negative supply means that the node is a demand node. Write the flow balance constraint for node 4

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