Ответ:
-2(2,7х-1)-(6-3,4х)+8(0,4х-2)=-5,4х+2-6+3,4х+3,2х-16=1,2х-20
1,2х-20, при х=-5/6
1,2*(-5/6)-20=-1-20=-21
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Ответ:
-2(2,7х-1)-(6-3,4х)+8(0,4х-2)=-5,4х+2-6+3,4х+3,2х-16=1,2х-20
1,2х-20, при х=-5/6
1,2*(-5/6)-20=-1-20=-21