var('x,y,z')
p1=vector([1, 1, -1])
n=vector([x,y,z])
plane_eq=n.inner_product(p1)==0
print "plane_equation=", plane_eq
implicit_plot3d(plane_eq, (x, -4, 4), (y, -7, 7), (z, -3, 3))
plane_equation= x + y - z == 0 plane_equation= x + y - z == 0 Sleeping...
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