**Step-by-step explanation:**

There are 2 common factors of 35 and 45, that are 1 and 5. Therefore, the greatest common factor of 35 and 45 is 5.

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**Step-by-step explanation:**

There are 2 common factors of 35 and 45, that are 1 and 5. Therefore, the greatest common factor of 35 and 45 is 5.