The comparative of equality is formed with the particle so (= as) + adjective/adverb + particle wie (= as).

Some examples                 particle so   adjective particle wie       Dieses Zimmer ist   so   teuer wie das nebenan.   This room is   as   expensive as the one next door.   Die Rosen sind   so   hübsch wie die Nelken.   The roses are   as   beautiful as the carnations.