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Answers ( 1 )
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    f (7) = p.7 7  + q.7 3  + r.7 - 4 = -p. (- 7) 7  - q. (- 7) 3  - r. (- 7) - 4

    = - [p. (- 7) 7  + q. (- 7) 3  + r. (- 7)] - 4 = - [f (-7) + 4] - 4

    = - (3 + 4) - 4 = -7 - 4 = -11

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