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17. 19. A

(4x – 2) br

B (3x + 7) br C

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18. 20.
d x + 2 +dn 2 x - 1n
4 3

4a + 8 – 5a – (– 3a + 7) – 5

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5 x + 9 11 x + 12
A) B)
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4 3

A) D ² B) D ²

C) D ² D) D

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