$$8\times2.5^{2}\times1^{6}-20\times2.5\times1$$
$0$
$$8\times 6.25\times 1^{6}-20\times 2.5\times 1$$
$$50\times 1^{6}-20\times 2.5\times 1$$
$$50\times 1-20\times 2.5\times 1$$
$$50-20\times 2.5\times 1$$
$$50-50\times 1$$
$$50-50$$
$$0$$
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