int fail = 0, iter = 0;
            do
            {
                fail = 0;
                iter++;
                for (int i = 0; i < inequalities.Length; i++)
                {
                    int vars = inequalities[i].Length;

                    for (int j = 0; j < vars; j++)
                    {
                        float value = 0;

                        for (int k = 0; k < vars; k++)
                        {
                            if (k == j) continue;

                            if (-inequalities[i][k] > 0)
                                value -= inequalities[i][k] * upper[k];

                            else
                                value -= inequalities[i][k] * lower[k];

                        }

                        value += b[i];

                        value /= inequalities[i][j];

                        if (inequalities[i][j] < 0)
                        {
                            if (lower[j] < value)
                            {
                                lower[j] = value;
                                fail++;
                            }
                        }
                        else
                        {
                            if (upper[j] > value)
                            {
                                upper[j] = value;
                                fail++;
                            }
                        }
                    }

                }
            } while (fail != 0);