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`Nutrient = {x'[t] == (k/[Va]) (y[t] - x[t]), y'[t] == (k/[Vb]) (x[t] - y[t]), x[0] == [x0], y[0] == [y0]};` `Solution = DSolve[Nutrient, {x[t], y[t]}, {t, 0, 200}`