@Override
	public Operation simplify() {
		Expression L = Simplify.mod(this.L);
		Expression R = Simplify.mod(this.R);
		if( "0.0".equals(L.getString()) ){
			return R.operation;
		} else if ( "0.0".equals(R.getString()) ){
			return L.operation;
		} else {
			return new Sum( L, R );
		}
	}