6. Maximize z-x, + 2x2 + 3x3 + x4 subject to 2x, + x, + x, + 2x, s 18 3x, +5x2+ 2x,+ 3x, s24 3x, + 2x2 + x+ X4s 12 x, 2 0, -1,2, 3, 4.

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