Автор - CAH9Iu3IIIkoJIbI

13 - 4,5y = 2(3,7 - 0,5y)

Ответ

Автор - lisakashina
13-4,5у=7,4-1у
-4,5у+1у=7,4-13
-3,5у=-5,6
у=-5,6:(-3,5)
у=-1,6.

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