$$100x+5x \times 3x2$$
$5x\left(3x_{2}+20\right)$
$$5\left(20x+3xx_{2}\right)$$
$$x\left(20+3x_{2}\right)$$
$$5x\left(3x_{2}+20\right)$$
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$15xx_{2}+100x$
$$100x+15xx_{2}$$
