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1. What should be added to 2p - q + r to make it p + q - 2r?
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Sagot :

Answer:

-p + 2q - 3r

Step-by-step explanation:

(p + q - 2r) - (2p - q + r)

= p + q - 2r - 2p + q - r

= -p + 2q - 3r

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