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It is convenient to keep equations in the form expression == 0 and furthermore functions dealing with equations will typically understand a given expression as an equation of that form. Hence, you can avoid using == in favor of using the difference between the lhs and rhs:

eq_a = diff(r_a, t) - v0*(r_b - r_a)/(r_b - r_a).norm()

If you still want to get explicit equations with == from the above vector - here is a way:

eq_a_eq = [eq==0 for eq in eq_a]