同価 is read as どうか (douka) and means equivalent.
どうか
douka
どうし
fellow
どうほう
brethren
どうめい
Japanese Confederation of Labor (1964-1987) (abbr)
どうきゅうせい
classmate
comrade
どうはん
accompanying
どうしうち
internecine strife
companions
どうぎご
synonym
same surname
どうりょう
coworker
どうりつ
the same ratio or percentage