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extrema 3/2*x^2*y^2+5x+18y+25 over -5 <= 2x-y<= 5 and 0 <= x + 2y <= 2.5
extrema 3/2*x^2*y^2+5x+18y+25 over -5 <= 2x-y<= 5 and 0 <= x + 2y <= 2.5
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