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Anuta_ua [19.1K]
2 years ago
10

Does anyone know this?

Mathematics
1 answer:
Lera25 [3.4K]2 years ago
4 0

Answer:

8/21

Step-by-step explanation:

-1/3 + 5/7=1×7 =-7/21 +15/21

- × -

3. 7

-7/21 + 15/21= -7+15 = 8/21

-----

21

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