Growth with restrictions (finding maxvalue of constant term)

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I have the following differencial ekvation that shows the population change for fish, where x is a constant death rate by accident. How can I determine the maximum value of x so that the fish population wont die out in the future? $$ n'(t)=0.12(1-(n(t)/10000))\cdot n(t)-x,\\ n(0)=250000. $$