void iter(float a[50][50], float(&x)[50][50], int ite, int n)
{
	int suma;
	for (int i = 1; i <= n; i++)
	{
		suma = x[0][i];
		for (int j = 1; j < i; j++)    // first sum in 7.66 formula from instruction
		{
			suma += (-a[i][j]) / (a[i][i]) * x[ite][j];
			x[ite][i] = suma;
		}

		suma = 0;
		for (int j = i; j <= n; j++)	// second sum from 7.66 formula
		{
			suma += ((-a[i][j]) / (a[i][i])) * (x[ite - 1][i]);

		}
		x[ite][i] += (a[i][n] / a[i][i]) + suma;    // whole 7.66 formula
		cout << "x[" << ite << "][" << i << "] = " << x[ite][i] << endl;
	}
}