Can you print your origin and destination variables? When using the following, I don't have any problem:
>>> var('a,b,c,x,y,z') (a, b, c, x, y, z) >>> eq=Eq(sqrt((x-a)**2+(1-b)**2+(z-c)**2), 2) >>> solve(eq, x) [a - sqrt(-b**2 + 2*b - c**2 + 2*c*z - z**2 + 3), a + sqrt(-b**2 + 2*b - c**2 + 2*c*z - z**2 + 3)] -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.