Question: What is the flow conservation constraint for the origin node? x 1 2 + x 1 3 = 1 - x 4 7 - x

What is the flow conservation constraint for the origin node?
x12+x13=1
-x47-x57-x67=-1
x12+x13=-1
10x12+12x13=22
What is the flow conservation constraint for the origin node? x12+x13=1

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