f(x) = 8x2 + 7x4 + x6 → max;
x1 − 2x2 − 3x4 − 2x6 = 12,
4x2 + x3 − 4x4 − 3x6 = 12,
5x2 + 5x4 + x5 + x6 = 25,
xj ≥ 0 (j = 1, 6).