Solution: Mother and daughter

The code...

local
   proc {Bike I}
      Factor = 12    % a guess necessary due to Finite Domains
      M D

   in
      {FD.decl I}   
      M = 45 * Factor
      D = 12 * Factor
      M + I =: 3 * (D + I)
      {FD.distribute ff [I]}

   end

in
   {ExploreOne Bike}

end

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