Question

19. 5- a - b; 7 + 2a; 3b - 2c; - 4+ a- 2b.
20. p - q + 7r + 3; 2q - 3r + 5; 3r + 2p; p- 8 - 7r.​

Answer 1

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7 + 2a; 3b - 2c; - 4+ a- 2b.

20. p - q + 7r + 3; 2q - 3r + 5; 3r + 2p; p- 8 - 7r.

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6a+5b-2c+3r

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