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)]
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