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I am having trouble creating a differential equation from my flow line that models population of deer. The flow line has two nodes, a sink (attractor), and a source (repeller). I need to come up with a D.E from the flow line.

my "skeleton equation looks like this"

dp/dt = p(1-(p/4))((p/6)-1)(1-(y/8))

but this doesnt work, i've rearranged so many ways and doesnt match the flow line