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Ответ

Ответ дан
zdiana03

Ответ:

7а-9в-3в+2а=9а-12в

-3х^2-5х+1+3х^2+2х-9

1+2с^2-2с=2с^2-4с+28

-2с-4с=28-1

-6с=27

с=4.5

Объяснение:

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