YES

1 decompositions
 #0 -----------
   1: +(x,y) -> +(y,x)
   2: *(+(x,y),z) -> +(*(x,z),*(y,z))
   3: *(+(y,x),z) -> +(*(x,z),*(y,z))

@Development Closedness
--- R
   1: +(x,y) -> +(y,x)
   2: *(+(x,y),z) -> +(*(x,z),*(y,z))
   3: *(+(y,x),z) -> +(*(x,z),*(y,z))

--- S
   1: +(x,y) -> +(y,x)
   2: *(+(x,y),z) -> +(*(x,z),*(y,z))
   3: *(+(y,x),z) -> +(*(x,z),*(y,z))