Hi again list,
This time I come with a problem of solving an algebraic expression, the
solution has the variable x on it!
sage: reset()
sage: var('x')
sage: var('mp', latex_name=r"m_\pi")
sage: var('me', latex_name=r"m_e")
sage: f(x) = mp - sqrt(x^2 + me^2) - x
sage: solve(f(x)==0, x)
[x == mp - sqrt(me^2 + x^2)]
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