$$4x { y }^{ 2 } -4xyz+x { z }^{ 2 }$$
$x\left(2y-z\right)^{2}$
$$x\left(4y^{2}-4yz+z^{2}\right)$$
$$\left(2y-z\right)^{2}$$
$$x\left(2y-z\right)^{2}$$
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