$2x^{-2}$
$-9\left(x-7\right)\left(x+3\right)$
$\lim_{x\to0}\left(\frac{1-e^e}{x}\right)$
$280x-80y=-40$
$4\cdot1-3$
$\sqrt[3]{-64}-14-20+5^3-1000\cdot5$
$x^22y-z^2+x^2yz^2=20$
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