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10-04-2020
Mathematics

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Аноним Аноним

10-04-2020

Step-by-step explanation:

Given

( 7x² - 5x - 1 ) - ( 2x² - 9x - 2)

= 7x² - 5x - 1 - 2x² + 9x + 2

= 5x² + 4x + 1

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