Ответ:\(2(x-7y+3z)=2x-14y+6z\).\(-7(5-a-4b)=-35+7a+28b\).\((c-8d)(-1.2)=-1.2c+9.6d\).\(-0.6x-(-5+3m-1.4n)=-0.6x+5-3m+1.4n\).