Long description
Three streets form a triangle with a horizontal street, vertical street to the right, and a diagonal street that rises across the diagram. At the left vertex, 800 cars enter and 300 cars exit. At the lower right vertex, x cars enter from within the triangle, 400 cars enter from outside, and 200 cars exit. At the upper right vertex, y cars enter from the vertical street, an unknown number enter from along the diagonal, and 700 cars exit.
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