YES

Problem:
 app(app(app(compose(),f),g),x) -> app(f,app(g,x))

Proof:
 DP Processor:
  DPs:
   app#(app(app(compose(),f),g),x) -> app#(g,x)
   app#(app(app(compose(),f),g),x) -> app#(f,app(g,x))
  TRS:
   app(app(app(compose(),f),g),x) -> app(f,app(g,x))
  CDG Processor:
   DPs:
    app#(app(app(compose(),f),g),x) -> app#(g,x)
    app#(app(app(compose(),f),g),x) -> app#(f,app(g,x))
   TRS:
    app(app(app(compose(),f),g),x) -> app(f,app(g,x))
   graph:
    
   Qed