c and cubic equations.
Roots are sorted. [Ind.Eng.Chem.Res. 53(6), 2529 (2014)]

<br><tt>subroutine solve_cubic(A3,A2,A1,A0, x1,x2,x3)</tt>
<br><tt>subroutine solve_quadr(A2,A1,A0, x1,x2)</tt>

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