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Please solve I don't understand ​

Please solve I don't understand ​-example-1

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Answer:

Explanation:

3. n - 8(9n + 5) = n - 72n + 40 = -71n - 40

4. 6b - 24b + 15 = -18b + 15

5. -x + 2 + 7x = 6x + 2

6. -50 - 40x + 7 = -40x - 43

7. 10 - 81 -90n = -71 -90n

8. -4a + 32 + 6a + 24 = 2a + 56

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