6*x - y = -6
2 y + 2*x = 2
2*x^2 + y = 2
-2
-6
-1
0
x1 = -1.0 y1 = -2.188181153093019e-22
x2 = -1.0 y2 = -5.184439362852098e-23
x3 = -2.0 y3 = -6.0
x4 = -1.0 y4 = -8.763487362956218e-23