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Ответ

Автор - Fuijkand

12x-x-1,9=-2(0,4x-2,6)

1,2x-x-1,9=-0,8x+5,2

0,2x-1,9=-0,8x+5,2

0,2x+0,8x-1,9=5,2

0,2x+0,8x=5,2+1,9

x=5,2+1,9

x=7,1

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