$$12 , 100 x ( 0.01 x - 0.19 y z )$$
$12x\left(19yz-x\right)$
$$12=2^{2}\times 3$$
$$12x\left(19yz-x\right)$$
$$-12x^{2}+228xyz$$
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$12,x\left(x-19yz\right)$