$\frac{x^{-1}}{x^{-1}\cdot x^{-7}}$
$3\left(2\right)^3-4\left(2\right)^5-3-2\left(2\right)^2$
$\lim_{x\to0}\left(-\frac{1^x}{x^2-x}\right)$
$\left(\frac{3}{5}x+\frac{2}{3}y\right)^2$
$2x^4-7x^3-14+8$
$4x+y-7x-10y$
$5x-4x-2x+x$
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