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Ответ

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asistan

1)х+6,4=18

х=18-6,4

х=11,6

2)7х+11,9=0

7х=-11,9

х=-1,7

3)6х-0.8=3х+2,2

6х-3х=2,2+0,8

3х=3

х=1

4)5х-(7х+7)=9

5х-7х-7=9

-2х=9+7

-2х=16

х=-8

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