Complete (O7, O8) contribution to (B)over-bar → Xsγ at O(αs2)

We calculate the set of O(alpha(2)(s)) corrections to the branching ratio and to the photon energy spectrum of the decay process (B) over bar -> X-s gamma originating from the interference of diagrams involving the electromagnetic dipole operator O-7 with diagrams involving the chromomagnetic dipole operator O-8. The corrections evaluated here are one of the elements needed to complete the calculations of the (B) over bar -> X-s gamma branching ratio at next-to-next-to-leading order in QCD. We conclude that this set of corrections does not change the central value of the standard model prediction for Br((B) over bar -> X-s gamma) by more than 1%.