$$2x+y+z=s$$
$x=\frac{s-z-y}{2}$
$$2x+z=s-y$$
$$2x=s-y-z$$
$$2x=s-z-y$$
$$\frac{2x}{2}=\frac{s-z-y}{2}$$
$$x=\frac{s-z-y}{2}$$
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$s=2x+y+z$
$$s=2x+y+z$$
