eq21: x + y + z = 0
eq76b: ((2 * x) + (2 * y) + (2 * z) = 5,(2 * x) + (2 * y) + (2 * z) = 4)
eq22: x + (2 * y) + (2 * z) = 5
eq23: (-x) + y - z = 0
d_{1} = IntersectPath(eq23, eq21)
d_{2} = IntersectPath(eq22, eq23)
A = Intersect(d_{1}, d_{2})