を前提に => On the premise of N1
Premise
も同然 => just like; same as ~ N2
と[共「とも」]に => Both, at the same time N2
Information, Report
と同時に => at the same time as; while; simultaneously ~ N2
出す => to begin to; to start to; to burst into; ... out (e.g. to jump out, to carry out)​ N4
~もどうぜんだ(~も同然だ)      => just like; same as ~ N1
も[同然「どうぜん」]だ => The same as saying A, as good as A N2
Adjectival, Descriptions