YES
O(n^3)
TRS:
 {
       minus(minus(x)) -> x,
  +(minus(x), +(x, y)) -> y,
  +(+(x, y), minus(y)) -> x,
        minux(+(x, y)) -> +(minus(y), minus(x))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
         minus(minus(x)) -> x,
    +(minus(x), +(x, y)) -> y,
    +(+(x, y), minus(y)) -> x,
          minux(+(x, y)) -> +(minus(y), minus(x))
   }
  Matrix Interpretation:
   Interpretation class: triangular
           [X2]    [1 1 0][X2]   [1]
   [minux]([X1]) = [0 1 1][X1] + [1]
           [X0]    [0 0 1][X0]   [1]
   
       [X5]  [X2]    [1 0 1][X5]   [1 0 1][X2]   [0]
   [+]([X4], [X1]) = [0 1 1][X4] + [0 1 1][X1] + [0]
       [X3]  [X0]    [0 0 1][X3]   [0 0 1][X0]   [1]
   
           [X2]    [1 1 0][X2]   [0]
   [minus]([X1]) = [0 1 0][X1] + [1]
           [X0]    [0 0 1][X0]   [0]
   
   
   Qed