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Mariana [72]
2 years ago
13

F

Mathematics
1 answer:
Olegator [25]2 years ago
5 0

Answer:

21

Step-by-step explanation:

If x was more than 1, then it would be impossible because fx would have to be even, but 4x+3 would be odd. Therefore, x must equal 1, and f must equal 7. This means that 3f=21

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