x - y = -1
2 y - 7*x = 7
или
y1 = 1.707536704006448e-23 x1 = -1.0
y2 = 6.323710226198837e-24 x2 = -1.0
y3 = -2.255056870793446e-21 x3 = -1.0
y4 = -1.313007889946368e-23 x4 = -1.0
y5 = -2.491013868576231e-24 x5 = -1.0
y6 = 6.072054986670977e-25 x6 = -1.0
y7 = 3.406282715281835e-24 x7 = -1.0
y8 = 7.0 x8 = 6.0
y8 = 7.0 x8 = 6.0