1 1 1
1 2 2
1 3 3
1 4 4
1 5 5
1 6 6
1 7 7
0 0 0
0 0 0

x_1 + 1/2 x_2 + 1/3 x_3 + 1/4 x_4 + 1/5 x_5 + 1/6 x_6 + 1/7 x_7 = 0