If you are wanting to find d, then first +10d to both sides. You will get 0=9+d. Then, subtract 9 from both sides. You will get -9=d. That will be your answer.
If you are wanting to find d, then first +10d to both sides. You will get 0=9+d. Then, subtract 9 from both sides. You will get -9=d. That will be your answer.
