Maximize Z = ?15x1 + 30x2 + 25x3 subject to 4x1 + 2x2 + 3x3 <= 75 4x1 + 6x2 + 2x3 <= 60 x1 + x2 ? x3 <= ?80 x1>= 0, x2>= 0, x3>= 0