$$2-4(\frac{2x}{7}+\frac{1}{7})=\frac{3}{2}-x$$
$x=-\frac{1}{2}=-0.5$
$$28-56\left(\frac{2x}{7}+\frac{1}{7}\right)=21-14x$$
$$28-56\times \frac{2x+1}{7}=21-14x$$
$$28-8\left(2x+1\right)=21-14x$$
$$28-16x-8=21-14x$$
$$20-16x=21-14x$$
$$20-16x+14x=21$$
$$20-2x=21$$
$$-2x=21-20$$
$$-2x=1$$
$$x=\frac{1}{-2}$$
$$x=-\frac{1}{2}$$
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