Maxima Function
extract_linear_equations ([p_1, ..., p_n], [m_1, ..., m_n])
Makes a list of the coefficients of the noncommutative polynomials p_1, ..., p_n
of the noncommutative monomials m_1, ..., m_n.
The coefficients should be scalars. Use list_nc_monomials
to build the list of
monomials.