What's Eight Times A Number, Added To The Sum Of The Number And Nine Written As An Expression?

If the number is N, 8 times the number is 8N.
The sum of the number and 9 is (N+9).
When 8 times the number is added to the sum of the number and 9, you have
  8N + N + 9

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This can be simplified to
  9N + 9
And factored to
  9(N+1)