$$5x-7y-0.4(x-2y+z)$$
$\frac{23x-31y-2z}{5}$
$$5x-7y-0.4x+0.8y-0.4z$$
$$4.6x-7y+0.8y-0.4z$$
$$4.6x-6.2y-0.4z$$
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