Solve the linear programming problem by the simplex method. Maximize P = x + 4y - 2z subject to 3x + y 2x + y -x + y + z ≤ 20 x ≥ 0, y ≥ 0, z 20 The maximum is P = z ≤ 20 - Z≤ 10 z at (x, y, z) =

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