Автор - nozdrachevniki

а) 3∙(0,4х+1,4)=х-0,8;

Ответ

Автор - jekadva
3∙(0,4х+1,4)=х-0,8
1,2x+4,2=x-0,8
1,2x-x=-0,8-4,2
0,2x=-5
x=-5:0,2
x=-25

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