MAYBE
Time: 0.016

Problem:
 Equations:
  
 TRS:
  zero(sharp()) -> sharp()
  plusAC(x,sharp()) -> x
  plusAC(zero(x),zero(y)) -> zero(plusAC(x,y))
  plusAC(zero(x),one(y)) -> one(plusAC(x,y))
  plusAC(one(x),one(y)) -> j(plusAC(x,plusAC(y,one(sharp()))))
  plusAC(zero(x),j(y)) -> j(plusAC(x,y))
  plusAC(j(x),one(y)) -> zero(plusAC(x,y))
  plusAC(j(x),j(y)) -> one(plusAC(x,plusAC(y,j(sharp()))))
  minus(x,y) -> plusAC(x,opp(y))
  opp(sharp()) -> sharp()
  opp(zero(x)) -> zero(opp(x))
  opp(one(x)) -> j(opp(x))
  opp(j(x)) -> one(opp(x))
  multAC(x,sharp()) -> sharp()
  multAC(zero(x),y) -> zero(multAC(x,y))
  multAC(one(x),y) -> plusAC(zero(multAC(x,y)),y)

Proof:
 Open